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Finding the Fourth Proportional to 287,593.55, 431,343.61 and 135,790.34

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Solution

The fourth proportional to 287,593.55, 431,343.61 and 135,790.34 is: 203,663.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,593.55 : 431,343.61 = 135,790.34 : x
  2. Step 2: Convert to fraction form
    287,593.55/431,343.61 = 135,790.34/x
  3. Step 3: Cross multiply
    287,593.55x = 431,343.61 × 135,790.34
  4. Step 4: Simplify right side
    287,593.55x = 58,572,292,962.53
  5. Step 5: Solve for x
    x = 58,572,292,962.53/287,593.55
  6. Step 6: Final answer
    x = 203,663.44

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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.