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Finding the Fourth Proportional to 66.59, 91.86 and 44.78

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Solution

The fourth proportional to 66.59, 91.86 and 44.78 is: 61.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.59 : 91.86 = 44.78 : x
  2. Step 2: Convert to fraction form
    66.59/91.86 = 44.78/x
  3. Step 3: Cross multiply
    66.59x = 91.86 × 44.78
  4. Step 4: Simplify right side
    66.59x = 4,113.49
  5. Step 5: Solve for x
    x = 4,113.49/66.59
  6. Step 6: Final answer
    x = 61.77

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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.