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Finding the Fourth Proportional to 48.60, 72.54 and 42.12

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Solution

The fourth proportional to 48.60, 72.54 and 42.12 is: 62.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.60 : 72.54 = 42.12 : x
  2. Step 2: Convert to fraction form
    48.60/72.54 = 42.12/x
  3. Step 3: Cross multiply
    48.60x = 72.54 × 42.12
  4. Step 4: Simplify right side
    48.60x = 3,055.38
  5. Step 5: Solve for x
    x = 3,055.38/48.60
  6. Step 6: Final answer
    x = 62.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.