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Finding the Fourth Proportional to 602.76, 831.15 and 392.55

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Solution

The fourth proportional to 602.76, 831.15 and 392.55 is: 541.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.76 : 831.15 = 392.55 : x
  2. Step 2: Convert to fraction form
    602.76/831.15 = 392.55/x
  3. Step 3: Cross multiply
    602.76x = 831.15 × 392.55
  4. Step 4: Simplify right side
    602.76x = 326,267.93
  5. Step 5: Solve for x
    x = 326,267.93/602.76
  6. Step 6: Final answer
    x = 541.29

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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.