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Finding the Fourth Proportional to 338.88, 508.40 and 247.80

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Solution

The fourth proportional to 338.88, 508.40 and 247.80 is: 371.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.88 : 508.40 = 247.80 : x
  2. Step 2: Convert to fraction form
    338.88/508.40 = 247.80/x
  3. Step 3: Cross multiply
    338.88x = 508.40 × 247.80
  4. Step 4: Simplify right side
    338.88x = 125,981.52
  5. Step 5: Solve for x
    x = 125,981.52/338.88
  6. Step 6: Final answer
    x = 371.76

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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.