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Finding the Fourth Proportional to 52.74, 78.98 and 39.15

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Solution

The fourth proportional to 52.74, 78.98 and 39.15 is: 58.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.74 : 78.98 = 39.15 : x
  2. Step 2: Convert to fraction form
    52.74/78.98 = 39.15/x
  3. Step 3: Cross multiply
    52.74x = 78.98 × 39.15
  4. Step 4: Simplify right side
    52.74x = 3,091.87
  5. Step 5: Solve for x
    x = 3,091.87/52.74
  6. Step 6: Final answer
    x = 58.62

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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.