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Finding the Fourth Proportional to 411.52, 612.80 and 392.64

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Solution

The fourth proportional to 411.52, 612.80 and 392.64 is: 584.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.52 : 612.80 = 392.64 : x
  2. Step 2: Convert to fraction form
    411.52/612.80 = 392.64/x
  3. Step 3: Cross multiply
    411.52x = 612.80 × 392.64
  4. Step 4: Simplify right side
    411.52x = 240,609.79
  5. Step 5: Solve for x
    x = 240,609.79/411.52
  6. Step 6: Final answer
    x = 584.69

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.