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Finding the Fourth Proportional to 101.52, 151.56 and 90.84

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Solution

The fourth proportional to 101.52, 151.56 and 90.84 is: 135.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.52 : 151.56 = 90.84 : x
  2. Step 2: Convert to fraction form
    101.52/151.56 = 90.84/x
  3. Step 3: Cross multiply
    101.52x = 151.56 × 90.84
  4. Step 4: Simplify right side
    101.52x = 13,767.71
  5. Step 5: Solve for x
    x = 13,767.71/101.52
  6. Step 6: Final answer
    x = 135.62

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.