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Finding the Fourth Proportional to 71.15, 98.18 and 55.61

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Solution

The fourth proportional to 71.15, 98.18 and 55.61 is: 76.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.15 : 98.18 = 55.61 : x
  2. Step 2: Convert to fraction form
    71.15/98.18 = 55.61/x
  3. Step 3: Cross multiply
    71.15x = 98.18 × 55.61
  4. Step 4: Simplify right side
    71.15x = 5,459.79
  5. Step 5: Solve for x
    x = 5,459.79/71.15
  6. Step 6: Final answer
    x = 76.74

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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.