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Finding the Fourth Proportional to 142.87, 214.27 and 91.43

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Solution

The fourth proportional to 142.87, 214.27 and 91.43 is: 137.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    142.87 : 214.27 = 91.43 : x
  2. Step 2: Convert to fraction form
    142.87/214.27 = 91.43/x
  3. Step 3: Cross multiply
    142.87x = 214.27 × 91.43
  4. Step 4: Simplify right side
    142.87x = 19,590.71
  5. Step 5: Solve for x
    x = 19,590.71/142.87
  6. Step 6: Final answer
    x = 137.12

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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.