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Finding the Fourth Proportional to 98, 135.24 and 66.92

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Solution

The fourth proportional to 98, 135.24 and 66.92 is: 92.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    98 : 135.24 = 66.92 : x
  2. Step 2: Convert to fraction form
    98/135.24 = 66.92/x
  3. Step 3: Cross multiply
    98x = 135.24 × 66.92
  4. Step 4: Simplify right side
    98x = 9,050.26
  5. Step 5: Solve for x
    x = 9,050.26/98
  6. Step 6: Final answer
    x = 92.35

Related Problems

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Double scale
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Similar ratio
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1.5x scale

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.