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Finding the Fourth Proportional to 476.54, 714.78 and 129.86

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Solution

The fourth proportional to 476.54, 714.78 and 129.86 is: 194.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.54 : 714.78 = 129.86 : x
  2. Step 2: Convert to fraction form
    476.54/714.78 = 129.86/x
  3. Step 3: Cross multiply
    476.54x = 714.78 × 129.86
  4. Step 4: Simplify right side
    476.54x = 92,821.33
  5. Step 5: Solve for x
    x = 92,821.33/476.54
  6. Step 6: Final answer
    x = 194.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.