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Finding the Fourth Proportional to 987.64, 1,481.68 and 338.84

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Solution

The fourth proportional to 987.64, 1,481.68 and 338.84 is: 508.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.64 : 1,481.68 = 338.84 : x
  2. Step 2: Convert to fraction form
    987.64/1,481.68 = 338.84/x
  3. Step 3: Cross multiply
    987.64x = 1,481.68 × 338.84
  4. Step 4: Simplify right side
    987.64x = 502,052.45
  5. Step 5: Solve for x
    x = 502,052.45/987.64
  6. Step 6: Final answer
    x = 508.34

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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.