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Finding the Fourth Proportional to 48.49, 66.78 and 42.31

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Solution

The fourth proportional to 48.49, 66.78 and 42.31 is: 58.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.49 : 66.78 = 42.31 : x
  2. Step 2: Convert to fraction form
    48.49/66.78 = 42.31/x
  3. Step 3: Cross multiply
    48.49x = 66.78 × 42.31
  4. Step 4: Simplify right side
    48.49x = 2,825.46
  5. Step 5: Solve for x
    x = 2,825.46/48.49
  6. Step 6: Final answer
    x = 58.27

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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.