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Finding the Fourth Proportional to 101.95, 153.03 and 90.61

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Solution

The fourth proportional to 101.95, 153.03 and 90.61 is: 136.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    101.95 : 153.03 = 90.61 : x
  2. Step 2: Convert to fraction form
    101.95/153.03 = 90.61/x
  3. Step 3: Cross multiply
    101.95x = 153.03 × 90.61
  4. Step 4: Simplify right side
    101.95x = 13,866.05
  5. Step 5: Solve for x
    x = 13,866.05/101.95
  6. Step 6: Final answer
    x = 136.01

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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.