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Finding the Fourth Proportional to 48.48, 66.91 and 42.31

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Solution

The fourth proportional to 48.48, 66.91 and 42.31 is: 58.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.48 : 66.91 = 42.31 : x
  2. Step 2: Convert to fraction form
    48.48/66.91 = 42.31/x
  3. Step 3: Cross multiply
    48.48x = 66.91 × 42.31
  4. Step 4: Simplify right side
    48.48x = 2,830.96
  5. Step 5: Solve for x
    x = 2,830.96/48.48
  6. Step 6: Final answer
    x = 58.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.