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Finding the Fourth Proportional to 431.97, 647.97 and 188.38

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Solution

The fourth proportional to 431.97, 647.97 and 188.38 is: 282.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.97 : 647.97 = 188.38 : x
  2. Step 2: Convert to fraction form
    431.97/647.97 = 188.38/x
  3. Step 3: Cross multiply
    431.97x = 647.97 × 188.38
  4. Step 4: Simplify right side
    431.97x = 122,064.59
  5. Step 5: Solve for x
    x = 122,064.59/431.97
  6. Step 6: Final answer
    x = 282.58

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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.