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Finding the Fourth Proportional to 308,586.78, 425,885.10 and 172,655.16

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Solution

The fourth proportional to 308,586.78, 425,885.10 and 172,655.16 is: 238,283.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,586.78 : 425,885.10 = 172,655.16 : x
  2. Step 2: Convert to fraction form
    308,586.78/425,885.10 = 172,655.16/x
  3. Step 3: Cross multiply
    308,586.78x = 425,885.10 × 172,655.16
  4. Step 4: Simplify right side
    308,586.78x = 73,531,260,082.12
  5. Step 5: Solve for x
    x = 73,531,260,082.12/308,586.78
  6. Step 6: Final answer
    x = 238,283.90

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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.