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Finding the Fourth Proportional to 145.21, 217.84 and 91.15

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Solution

The fourth proportional to 145.21, 217.84 and 91.15 is: 136.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.21 : 217.84 = 91.15 : x
  2. Step 2: Convert to fraction form
    145.21/217.84 = 91.15/x
  3. Step 3: Cross multiply
    145.21x = 217.84 × 91.15
  4. Step 4: Simplify right side
    145.21x = 19,856.12
  5. Step 5: Solve for x
    x = 19,856.12/145.21
  6. Step 6: Final answer
    x = 136.74

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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.