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Finding the Fourth Proportional to 71.70, 107 and 61.56

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Solution

The fourth proportional to 71.70, 107 and 61.56 is: 91.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.70 : 107 = 61.56 : x
  2. Step 2: Convert to fraction form
    71.70/107 = 61.56/x
  3. Step 3: Cross multiply
    71.70x = 107 × 61.56
  4. Step 4: Simplify right side
    71.70x = 6,586.92
  5. Step 5: Solve for x
    x = 6,586.92/71.70
  6. Step 6: Final answer
    x = 91.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.