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Finding the Fourth Proportional to 70.55, 97.31 and 48.71

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Solution

The fourth proportional to 70.55, 97.31 and 48.71 is: 67.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.55 : 97.31 = 48.71 : x
  2. Step 2: Convert to fraction form
    70.55/97.31 = 48.71/x
  3. Step 3: Cross multiply
    70.55x = 97.31 × 48.71
  4. Step 4: Simplify right side
    70.55x = 4,739.97
  5. Step 5: Solve for x
    x = 4,739.97/70.55
  6. Step 6: Final answer
    x = 67.19

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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.