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Finding the Fourth Proportional to 602.28, 831.15 and 392.81

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Solution

The fourth proportional to 602.28, 831.15 and 392.81 is: 542.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.28 : 831.15 = 392.81 : x
  2. Step 2: Convert to fraction form
    602.28/831.15 = 392.81/x
  3. Step 3: Cross multiply
    602.28x = 831.15 × 392.81
  4. Step 4: Simplify right side
    602.28x = 326,483.10
  5. Step 5: Solve for x
    x = 326,483.10/602.28
  6. Step 6: Final answer
    x = 542.08

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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.