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Finding the Fourth Proportional to 431.71, 647.45 and 143.11

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Solution

The fourth proportional to 431.71, 647.45 and 143.11 is: 214.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.71 : 647.45 = 143.11 : x
  2. Step 2: Convert to fraction form
    431.71/647.45 = 143.11/x
  3. Step 3: Cross multiply
    431.71x = 647.45 × 143.11
  4. Step 4: Simplify right side
    431.71x = 92,653.33
  5. Step 5: Solve for x
    x = 92,653.33/431.71
  6. Step 6: Final answer
    x = 214.62

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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.