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Finding the Fourth Proportional to 48.70, 72.96 and 28.42

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Solution

The fourth proportional to 48.70, 72.96 and 28.42 is: 42.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.70 : 72.96 = 28.42 : x
  2. Step 2: Convert to fraction form
    48.70/72.96 = 28.42/x
  3. Step 3: Cross multiply
    48.70x = 72.96 × 28.42
  4. Step 4: Simplify right side
    48.70x = 2,073.52
  5. Step 5: Solve for x
    x = 2,073.52/48.70
  6. Step 6: Final answer
    x = 42.58

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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.