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Finding the Fourth Proportional to 657,172.78, 906,989.21 and 385,307.62

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Solution

The fourth proportional to 657,172.78, 906,989.21 and 385,307.62 is: 531,777.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    657,172.78 : 906,989.21 = 385,307.62 : x
  2. Step 2: Convert to fraction form
    657,172.78/906,989.21 = 385,307.62/x
  3. Step 3: Cross multiply
    657,172.78x = 906,989.21 × 385,307.62
  4. Step 4: Simplify right side
    657,172.78x = 349,469,853,870.78
  5. Step 5: Solve for x
    x = 349,469,853,870.78/657,172.78
  6. Step 6: Final answer
    x = 531,777.74

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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.