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Finding the Fourth Proportional to 431.19, 646.20 and 187.38

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Solution

The fourth proportional to 431.19, 646.20 and 187.38 is: 280.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.19 : 646.20 = 187.38 : x
  2. Step 2: Convert to fraction form
    431.19/646.20 = 187.38/x
  3. Step 3: Cross multiply
    431.19x = 646.20 × 187.38
  4. Step 4: Simplify right side
    431.19x = 121,084.96
  5. Step 5: Solve for x
    x = 121,084.96/431.19
  6. Step 6: Final answer
    x = 280.82

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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.