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Finding the Fourth Proportional to 431.59, 647.50 and 143.23

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Solution

The fourth proportional to 431.59, 647.50 and 143.23 is: 214.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.59 : 647.50 = 143.23 : x
  2. Step 2: Convert to fraction form
    431.59/647.50 = 143.23/x
  3. Step 3: Cross multiply
    431.59x = 647.50 × 143.23
  4. Step 4: Simplify right side
    431.59x = 92,738.19
  5. Step 5: Solve for x
    x = 92,738.19/431.59
  6. Step 6: Final answer
    x = 214.88

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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.