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Finding the Fourth Proportional to 916.92, 1,265.42 and 602.20

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Solution

The fourth proportional to 916.92, 1,265.42 and 602.20 is: 831.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    916.92 : 1,265.42 = 602.20 : x
  2. Step 2: Convert to fraction form
    916.92/1,265.42 = 602.20/x
  3. Step 3: Cross multiply
    916.92x = 1,265.42 × 602.20
  4. Step 4: Simplify right side
    916.92x = 762,035.92
  5. Step 5: Solve for x
    x = 762,035.92/916.92
  6. Step 6: Final answer
    x = 831.08

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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.