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Finding the Fourth Proportional to 47.85, 71.49 and 40.20

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Solution

The fourth proportional to 47.85, 71.49 and 40.20 is: 60.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.85 : 71.49 = 40.20 : x
  2. Step 2: Convert to fraction form
    47.85/71.49 = 40.20/x
  3. Step 3: Cross multiply
    47.85x = 71.49 × 40.20
  4. Step 4: Simplify right side
    47.85x = 2,873.90
  5. Step 5: Solve for x
    x = 2,873.90/47.85
  6. Step 6: Final answer
    x = 60.06

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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.