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Finding the Fourth Proportional to 92.98, 139.20 and 90.64

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Solution

The fourth proportional to 92.98, 139.20 and 90.64 is: 135.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.98 : 139.20 = 90.64 : x
  2. Step 2: Convert to fraction form
    92.98/139.20 = 90.64/x
  3. Step 3: Cross multiply
    92.98x = 139.20 × 90.64
  4. Step 4: Simplify right side
    92.98x = 12,617.09
  5. Step 5: Solve for x
    x = 12,617.09/92.98
  6. Step 6: Final answer
    x = 135.70

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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.