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Finding the Fourth Proportional to 91.69, 126.41 and 78.52

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Solution

The fourth proportional to 91.69, 126.41 and 78.52 is: 108.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.69 : 126.41 = 78.52 : x
  2. Step 2: Convert to fraction form
    91.69/126.41 = 78.52/x
  3. Step 3: Cross multiply
    91.69x = 126.41 × 78.52
  4. Step 4: Simplify right side
    91.69x = 9,925.32
  5. Step 5: Solve for x
    x = 9,925.32/91.69
  6. Step 6: Final answer
    x = 108.25

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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.