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Finding the Fourth Proportional to 52.31, 78.45 and 13.79

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Solution

The fourth proportional to 52.31, 78.45 and 13.79 is: 20.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    52.31 : 78.45 = 13.79 : x
  2. Step 2: Convert to fraction form
    52.31/78.45 = 13.79/x
  3. Step 3: Cross multiply
    52.31x = 78.45 × 13.79
  4. Step 4: Simplify right side
    52.31x = 1,081.43
  5. Step 5: Solve for x
    x = 1,081.43/52.31
  6. Step 6: Final answer
    x = 20.68

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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.