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Finding the Fourth Proportional to 644,755.59, 889,486.69 and 402,617.78

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Solution

The fourth proportional to 644,755.59, 889,486.69 and 402,617.78 is: 555,440.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,755.59 : 889,486.69 = 402,617.78 : x
  2. Step 2: Convert to fraction form
    644,755.59/889,486.69 = 402,617.78/x
  3. Step 3: Cross multiply
    644,755.59x = 889,486.69 × 402,617.78
  4. Step 4: Simplify right side
    644,755.59x = 358,123,157,684.52
  5. Step 5: Solve for x
    x = 358,123,157,684.52/644,755.59
  6. Step 6: Final answer
    x = 555,440.17

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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.