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Finding the Fourth Proportional to 1,172,797,978.86, 1,618,480,617.39 and 644,210,809.74

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Solution

The fourth proportional to 1,172,797,978.86, 1,618,480,617.39 and 644,210,809.74 is: 889,021,577.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,172,797,978.86 : 1,618,480,617.39 = 644,210,809.74 : x
  2. Step 2: Convert to fraction form
    1,172,797,978.86/1,618,480,617.39 = 644,210,809.74/x
  3. Step 3: Cross multiply
    1,172,797,978.86x = 1,618,480,617.39 × 644,210,809.74
  4. Step 4: Simplify right side
    1,172,797,978.86x = 1,042,642,709,077,307,136
  5. Step 5: Solve for x
    x = 1,042,642,709,077,307,136/1,172,797,978.86
  6. Step 6: Final answer
    x = 889,021,577.35

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.