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Finding the Fourth Proportional to 48.35, 72.39 and 42.90

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Solution

The fourth proportional to 48.35, 72.39 and 42.90 is: 64.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.35 : 72.39 = 42.90 : x
  2. Step 2: Convert to fraction form
    48.35/72.39 = 42.90/x
  3. Step 3: Cross multiply
    48.35x = 72.39 × 42.90
  4. Step 4: Simplify right side
    48.35x = 3,105.53
  5. Step 5: Solve for x
    x = 3,105.53/48.35
  6. Step 6: Final answer
    x = 64.23

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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.