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Finding the Fourth Proportional to 52.12, 71.76 and 39.16

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Solution

The fourth proportional to 52.12, 71.76 and 39.16 is: 53.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.12 : 71.76 = 39.16 : x
  2. Step 2: Convert to fraction form
    52.12/71.76 = 39.16/x
  3. Step 3: Cross multiply
    52.12x = 71.76 × 39.16
  4. Step 4: Simplify right side
    52.12x = 2,810.12
  5. Step 5: Solve for x
    x = 2,810.12/52.12
  6. Step 6: Final answer
    x = 53.92

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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.