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Finding the Fourth Proportional to 71.67, 98.77 and 65.12

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Solution

The fourth proportional to 71.67, 98.77 and 65.12 is: 89.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.67 : 98.77 = 65.12 : x
  2. Step 2: Convert to fraction form
    71.67/98.77 = 65.12/x
  3. Step 3: Cross multiply
    71.67x = 98.77 × 65.12
  4. Step 4: Simplify right side
    71.67x = 6,431.58
  5. Step 5: Solve for x
    x = 6,431.58/71.67
  6. Step 6: Final answer
    x = 89.74

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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.