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Finding the Fourth Proportional to 145.18, 217.46 and 128.10

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Solution

The fourth proportional to 145.18, 217.46 and 128.10 is: 191.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.18 : 217.46 = 128.10 : x
  2. Step 2: Convert to fraction form
    145.18/217.46 = 128.10/x
  3. Step 3: Cross multiply
    145.18x = 217.46 × 128.10
  4. Step 4: Simplify right side
    145.18x = 27,856.63
  5. Step 5: Solve for x
    x = 27,856.63/145.18
  6. Step 6: Final answer
    x = 191.88

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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.