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Finding the Fourth Proportional to 90.61, 135.76 and 76.94

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Solution

The fourth proportional to 90.61, 135.76 and 76.94 is: 115.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.61 : 135.76 = 76.94 : x
  2. Step 2: Convert to fraction form
    90.61/135.76 = 76.94/x
  3. Step 3: Cross multiply
    90.61x = 135.76 × 76.94
  4. Step 4: Simplify right side
    90.61x = 10,445.37
  5. Step 5: Solve for x
    x = 10,445.37/90.61
  6. Step 6: Final answer
    x = 115.28

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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.