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Finding the Fourth Proportional to 47.47, 65.54 and 39.70

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Solution

The fourth proportional to 47.47, 65.54 and 39.70 is: 54.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.47 : 65.54 = 39.70 : x
  2. Step 2: Convert to fraction form
    47.47/65.54 = 39.70/x
  3. Step 3: Cross multiply
    47.47x = 65.54 × 39.70
  4. Step 4: Simplify right side
    47.47x = 2,601.94
  5. Step 5: Solve for x
    x = 2,601.94/47.47
  6. Step 6: Final answer
    x = 54.81

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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.