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Finding the Fourth Proportional to 70.47, 97.12 and 57.18

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Solution

The fourth proportional to 70.47, 97.12 and 57.18 is: 78.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.47 : 97.12 = 57.18 : x
  2. Step 2: Convert to fraction form
    70.47/97.12 = 57.18/x
  3. Step 3: Cross multiply
    70.47x = 97.12 × 57.18
  4. Step 4: Simplify right side
    70.47x = 5,553.64
  5. Step 5: Solve for x
    x = 5,553.64/70.47
  6. Step 6: Final answer
    x = 78.81

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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.