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Finding the Fourth Proportional to 431.72, 647.68 and 143.14

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Solution

The fourth proportional to 431.72, 647.68 and 143.14 is: 214.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.72 : 647.68 = 143.14 : x
  2. Step 2: Convert to fraction form
    431.72/647.68 = 143.14/x
  3. Step 3: Cross multiply
    431.72x = 647.68 × 143.14
  4. Step 4: Simplify right side
    431.72x = 92,708.92
  5. Step 5: Solve for x
    x = 92,708.92/431.72
  6. Step 6: Final answer
    x = 214.74

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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.