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Finding the Fourth Proportional to 392.92, 542.28 and 315.52

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Solution

The fourth proportional to 392.92, 542.28 and 315.52 is: 435.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.92 : 542.28 = 315.52 : x
  2. Step 2: Convert to fraction form
    392.92/542.28 = 315.52/x
  3. Step 3: Cross multiply
    392.92x = 542.28 × 315.52
  4. Step 4: Simplify right side
    392.92x = 171,100.19
  5. Step 5: Solve for x
    x = 171,100.19/392.92
  6. Step 6: Final answer
    x = 435.46

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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.