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Finding the Fourth Proportional to 308,435.55, 425,638.65 and 172,469.76

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Solution

The fourth proportional to 308,435.55, 425,638.65 and 172,469.76 is: 238,006.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,435.55 : 425,638.65 = 172,469.76 : x
  2. Step 2: Convert to fraction form
    308,435.55/425,638.65 = 172,469.76/x
  3. Step 3: Cross multiply
    308,435.55x = 425,638.65 × 172,469.76
  4. Step 4: Simplify right side
    308,435.55x = 73,409,793,892.70
  5. Step 5: Solve for x
    x = 73,409,793,892.70/308,435.55
  6. Step 6: Final answer
    x = 238,006.92

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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.