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Finding the Fourth Proportional to 145.42, 218.17 and 42.71

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Solution

The fourth proportional to 145.42, 218.17 and 42.71 is: 64.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.42 : 218.17 = 42.71 : x
  2. Step 2: Convert to fraction form
    145.42/218.17 = 42.71/x
  3. Step 3: Cross multiply
    145.42x = 218.17 × 42.71
  4. Step 4: Simplify right side
    145.42x = 9,318.04
  5. Step 5: Solve for x
    x = 9,318.04/145.42
  6. Step 6: Final answer
    x = 64.08

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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.