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Finding the Fourth Proportional to 911.54, 1,257.96 and 497.54

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Solution

The fourth proportional to 911.54, 1,257.96 and 497.54 is: 686.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    911.54 : 1,257.96 = 497.54 : x
  2. Step 2: Convert to fraction form
    911.54/1,257.96 = 497.54/x
  3. Step 3: Cross multiply
    911.54x = 1,257.96 × 497.54
  4. Step 4: Simplify right side
    911.54x = 625,885.42
  5. Step 5: Solve for x
    x = 625,885.42/911.54
  6. Step 6: Final answer
    x = 686.62

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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.