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Finding the Fourth Proportional to 988.28, 1,481.88 and 338.76

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Solution

The fourth proportional to 988.28, 1,481.88 and 338.76 is: 507.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.28 : 1,481.88 = 338.76 : x
  2. Step 2: Convert to fraction form
    988.28/1,481.88 = 338.76/x
  3. Step 3: Cross multiply
    988.28x = 1,481.88 × 338.76
  4. Step 4: Simplify right side
    988.28x = 502,001.67
  5. Step 5: Solve for x
    x = 502,001.67/988.28
  6. Step 6: Final answer
    x = 507.95

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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.