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Finding the Fourth Proportional to 47.17, 65.14 and 31.64

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Solution

The fourth proportional to 47.17, 65.14 and 31.64 is: 43.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.17 : 65.14 = 31.64 : x
  2. Step 2: Convert to fraction form
    47.17/65.14 = 31.64/x
  3. Step 3: Cross multiply
    47.17x = 65.14 × 31.64
  4. Step 4: Simplify right side
    47.17x = 2,061.03
  5. Step 5: Solve for x
    x = 2,061.03/47.17
  6. Step 6: Final answer
    x = 43.69

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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.