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Finding the Fourth Proportional to 145.07, 217.56 and 71.87

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Solution

The fourth proportional to 145.07, 217.56 and 71.87 is: 107.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    145.07 : 217.56 = 71.87 : x
  2. Step 2: Convert to fraction form
    145.07/217.56 = 71.87/x
  3. Step 3: Cross multiply
    145.07x = 217.56 × 71.87
  4. Step 4: Simplify right side
    145.07x = 15,636.04
  5. Step 5: Solve for x
    x = 15,636.04/145.07
  6. Step 6: Final answer
    x = 107.78

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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.