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Finding the Fourth Proportional to 145.06, 217.42 and 90.88

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Solution

The fourth proportional to 145.06, 217.42 and 90.88 is: 136.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.06 : 217.42 = 90.88 : x
  2. Step 2: Convert to fraction form
    145.06/217.42 = 90.88/x
  3. Step 3: Cross multiply
    145.06x = 217.42 × 90.88
  4. Step 4: Simplify right side
    145.06x = 19,759.13
  5. Step 5: Solve for x
    x = 19,759.13/145.06
  6. Step 6: Final answer
    x = 136.21

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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.