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Finding the Fourth Proportional to 71.80, 99.17 and 47.35

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Solution

The fourth proportional to 71.80, 99.17 and 47.35 is: 65.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.80 : 99.17 = 47.35 : x
  2. Step 2: Convert to fraction form
    71.80/99.17 = 47.35/x
  3. Step 3: Cross multiply
    71.80x = 99.17 × 47.35
  4. Step 4: Simplify right side
    71.80x = 4,695.58
  5. Step 5: Solve for x
    x = 4,695.58/71.80
  6. Step 6: Final answer
    x = 65.40

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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.