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Finding the Fourth Proportional to 340.40, 511.20 and 249.20

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Solution

The fourth proportional to 340.40, 511.20 and 249.20 is: 374.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    340.40 : 511.20 = 249.20 : x
  2. Step 2: Convert to fraction form
    340.40/511.20 = 249.20/x
  3. Step 3: Cross multiply
    340.40x = 511.20 × 249.20
  4. Step 4: Simplify right side
    340.40x = 127,391.04
  5. Step 5: Solve for x
    x = 127,391.04/340.40
  6. Step 6: Final answer
    x = 374.24

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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.