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Finding the Fourth Proportional to 52.41, 78.61 and 13.89

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Solution

The fourth proportional to 52.41, 78.61 and 13.89 is: 20.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.41 : 78.61 = 13.89 : x
  2. Step 2: Convert to fraction form
    52.41/78.61 = 13.89/x
  3. Step 3: Cross multiply
    52.41x = 78.61 × 13.89
  4. Step 4: Simplify right side
    52.41x = 1,091.89
  5. Step 5: Solve for x
    x = 1,091.89/52.41
  6. Step 6: Final answer
    x = 20.83

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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.