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Finding the Fourth Proportional to 47.64, 71.16 and 39.64

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Solution

The fourth proportional to 47.64, 71.16 and 39.64 is: 59.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.64 : 71.16 = 39.64 : x
  2. Step 2: Convert to fraction form
    47.64/71.16 = 39.64/x
  3. Step 3: Cross multiply
    47.64x = 71.16 × 39.64
  4. Step 4: Simplify right side
    47.64x = 2,820.78
  5. Step 5: Solve for x
    x = 2,820.78/47.64
  6. Step 6: Final answer
    x = 59.21

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.