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Finding the Fourth Proportional to 48.74, 72.99 and 42.05

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Solution

The fourth proportional to 48.74, 72.99 and 42.05 is: 62.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.74 : 72.99 = 42.05 : x
  2. Step 2: Convert to fraction form
    48.74/72.99 = 42.05/x
  3. Step 3: Cross multiply
    48.74x = 72.99 × 42.05
  4. Step 4: Simplify right side
    48.74x = 3,068.86
  5. Step 5: Solve for x
    x = 3,068.86/48.74
  6. Step 6: Final answer
    x = 62.97

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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.