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Finding the Fourth Proportional to 431.06, 646.66 and 142.57

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Solution

The fourth proportional to 431.06, 646.66 and 142.57 is: 213.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.06 : 646.66 = 142.57 : x
  2. Step 2: Convert to fraction form
    431.06/646.66 = 142.57/x
  3. Step 3: Cross multiply
    431.06x = 646.66 × 142.57
  4. Step 4: Simplify right side
    431.06x = 92,192.88
  5. Step 5: Solve for x
    x = 92,192.88/431.06
  6. Step 6: Final answer
    x = 213.87

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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.