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Finding the Fourth Proportional to 660,663.98, 991,143.64 and 211,411.82

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Solution

The fourth proportional to 660,663.98, 991,143.64 and 211,411.82 is: 317,164.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,663.98 : 991,143.64 = 211,411.82 : x
  2. Step 2: Convert to fraction form
    660,663.98/991,143.64 = 211,411.82/x
  3. Step 3: Cross multiply
    660,663.98x = 991,143.64 × 211,411.82
  4. Step 4: Simplify right side
    660,663.98x = 209,539,483,555.95
  5. Step 5: Solve for x
    x = 209,539,483,555.95/660,663.98
  6. Step 6: Final answer
    x = 317,164.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.