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Finding the Fourth Proportional to 462.55, 636.85 and 392.45

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Solution

The fourth proportional to 462.55, 636.85 and 392.45 is: 540.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.55 : 636.85 = 392.45 : x
  2. Step 2: Convert to fraction form
    462.55/636.85 = 392.45/x
  3. Step 3: Cross multiply
    462.55x = 636.85 × 392.45
  4. Step 4: Simplify right side
    462.55x = 249,931.78
  5. Step 5: Solve for x
    x = 249,931.78/462.55
  6. Step 6: Final answer
    x = 540.33

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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.