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Finding the Fourth Proportional to 101.69, 140.64 and 90.76

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Solution

The fourth proportional to 101.69, 140.64 and 90.76 is: 125.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.69 : 140.64 = 90.76 : x
  2. Step 2: Convert to fraction form
    101.69/140.64 = 90.76/x
  3. Step 3: Cross multiply
    101.69x = 140.64 × 90.76
  4. Step 4: Simplify right side
    101.69x = 12,763.78
  5. Step 5: Solve for x
    x = 12,763.78/101.69
  6. Step 6: Final answer
    x = 125.52

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.