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Finding the Fourth Proportional to 431.30, 647.03 and 142.74

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Solution

The fourth proportional to 431.30, 647.03 and 142.74 is: 214.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.30 : 647.03 = 142.74 : x
  2. Step 2: Convert to fraction form
    431.30/647.03 = 142.74/x
  3. Step 3: Cross multiply
    431.30x = 647.03 × 142.74
  4. Step 4: Simplify right side
    431.30x = 92,357.42
  5. Step 5: Solve for x
    x = 92,357.42/431.30
  6. Step 6: Final answer
    x = 214.14

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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.