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Finding the Fourth Proportional to 71.60, 98.86 and 57.74

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Solution

The fourth proportional to 71.60, 98.86 and 57.74 is: 79.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.60 : 98.86 = 57.74 : x
  2. Step 2: Convert to fraction form
    71.60/98.86 = 57.74/x
  3. Step 3: Cross multiply
    71.60x = 98.86 × 57.74
  4. Step 4: Simplify right side
    71.60x = 5,708.18
  5. Step 5: Solve for x
    x = 5,708.18/71.60
  6. Step 6: Final answer
    x = 79.72

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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.