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Finding the Fourth Proportional to 92.58, 139.08 and 66.98

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Solution

The fourth proportional to 92.58, 139.08 and 66.98 is: 100.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.58 : 139.08 = 66.98 : x
  2. Step 2: Convert to fraction form
    92.58/139.08 = 66.98/x
  3. Step 3: Cross multiply
    92.58x = 139.08 × 66.98
  4. Step 4: Simplify right side
    92.58x = 9,315.58
  5. Step 5: Solve for x
    x = 9,315.58/92.58
  6. Step 6: Final answer
    x = 100.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.