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Finding the Fourth Proportional to 52.78, 79.05 and 39.91

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Solution

The fourth proportional to 52.78, 79.05 and 39.91 is: 59.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.78 : 79.05 = 39.91 : x
  2. Step 2: Convert to fraction form
    52.78/79.05 = 39.91/x
  3. Step 3: Cross multiply
    52.78x = 79.05 × 39.91
  4. Step 4: Simplify right side
    52.78x = 3,154.89
  5. Step 5: Solve for x
    x = 3,154.89/52.78
  6. Step 6: Final answer
    x = 59.77

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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.