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Finding the Fourth Proportional to 602.10, 831.27 and 392.64

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Solution

The fourth proportional to 602.10, 831.27 and 392.64 is: 542.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.10 : 831.27 = 392.64 : x
  2. Step 2: Convert to fraction form
    602.10/831.27 = 392.64/x
  3. Step 3: Cross multiply
    602.10x = 831.27 × 392.64
  4. Step 4: Simplify right side
    602.10x = 326,393.33
  5. Step 5: Solve for x
    x = 326,393.33/602.10
  6. Step 6: Final answer
    x = 542.09

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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.