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Finding the Fourth Proportional to 66.98, 99.98 and 61.57

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Solution

The fourth proportional to 66.98, 99.98 and 61.57 is: 91.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.98 : 99.98 = 61.57 : x
  2. Step 2: Convert to fraction form
    66.98/99.98 = 61.57/x
  3. Step 3: Cross multiply
    66.98x = 99.98 × 61.57
  4. Step 4: Simplify right side
    66.98x = 6,155.77
  5. Step 5: Solve for x
    x = 6,155.77/66.98
  6. Step 6: Final answer
    x = 91.90

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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.