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Finding the Fourth Proportional to 52.13, 78.20 and 31.81

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Solution

The fourth proportional to 52.13, 78.20 and 31.81 is: 47.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.13 : 78.20 = 31.81 : x
  2. Step 2: Convert to fraction form
    52.13/78.20 = 31.81/x
  3. Step 3: Cross multiply
    52.13x = 78.20 × 31.81
  4. Step 4: Simplify right side
    52.13x = 2,487.54
  5. Step 5: Solve for x
    x = 2,487.54/52.13
  6. Step 6: Final answer
    x = 47.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.