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Finding the Fourth Proportional to 90.44, 125.16 and 76.76

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Solution

The fourth proportional to 90.44, 125.16 and 76.76 is: 106.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.44 : 125.16 = 76.76 : x
  2. Step 2: Convert to fraction form
    90.44/125.16 = 76.76/x
  3. Step 3: Cross multiply
    90.44x = 125.16 × 76.76
  4. Step 4: Simplify right side
    90.44x = 9,607.28
  5. Step 5: Solve for x
    x = 9,607.28/90.44
  6. Step 6: Final answer
    x = 106.23

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Find fourth proportional to 45.22, 62.58 and 38.38
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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.