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Finding the Fourth Proportional to 71.86, 99.11 and 47.31

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Solution

The fourth proportional to 71.86, 99.11 and 47.31 is: 65.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.86 : 99.11 = 47.31 : x
  2. Step 2: Convert to fraction form
    71.86/99.11 = 47.31/x
  3. Step 3: Cross multiply
    71.86x = 99.11 × 47.31
  4. Step 4: Simplify right side
    71.86x = 4,688.16
  5. Step 5: Solve for x
    x = 4,688.16/71.86
  6. Step 6: Final answer
    x = 65.24

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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.