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Finding the Fourth Proportional to 644,308.64, 889,590.72 and 402,699.80

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Solution

The fourth proportional to 644,308.64, 889,590.72 and 402,699.80 is: 556,003.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,308.64 : 889,590.72 = 402,699.80 : x
  2. Step 2: Convert to fraction form
    644,308.64/889,590.72 = 402,699.80/x
  3. Step 3: Cross multiply
    644,308.64x = 889,590.72 × 402,699.80
  4. Step 4: Simplify right side
    644,308.64x = 358,238,005,025.86
  5. Step 5: Solve for x
    x = 358,238,005,025.86/644,308.64
  6. Step 6: Final answer
    x = 556,003.73

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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.