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Finding the Fourth Proportional to 516.60, 712.80 and 392.40

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Solution

The fourth proportional to 516.60, 712.80 and 392.40 is: 541.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.60 : 712.80 = 392.40 : x
  2. Step 2: Convert to fraction form
    516.60/712.80 = 392.40/x
  3. Step 3: Cross multiply
    516.60x = 712.80 × 392.40
  4. Step 4: Simplify right side
    516.60x = 279,702.72
  5. Step 5: Solve for x
    x = 279,702.72/516.60
  6. Step 6: Final answer
    x = 541.43

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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.