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Finding the Fourth Proportional to 91.98, 126.95 and 79.65

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Solution

The fourth proportional to 91.98, 126.95 and 79.65 is: 109.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.98 : 126.95 = 79.65 : x
  2. Step 2: Convert to fraction form
    91.98/126.95 = 79.65/x
  3. Step 3: Cross multiply
    91.98x = 126.95 × 79.65
  4. Step 4: Simplify right side
    91.98x = 10,111.17
  5. Step 5: Solve for x
    x = 10,111.17/91.98
  6. Step 6: Final answer
    x = 109.93

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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.