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Finding the Fourth Proportional to 431.80, 647.56 and 249.28

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Solution

The fourth proportional to 431.80, 647.56 and 249.28 is: 373.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    431.80 : 647.56 = 249.28 : x
  2. Step 2: Convert to fraction form
    431.80/647.56 = 249.28/x
  3. Step 3: Cross multiply
    431.80x = 647.56 × 249.28
  4. Step 4: Simplify right side
    431.80x = 161,423.76
  5. Step 5: Solve for x
    x = 161,423.76/431.80
  6. Step 6: Final answer
    x = 373.84

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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.