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Finding the Fourth Proportional to 988.60, 1,481.88 and 403.36

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Solution

The fourth proportional to 988.60, 1,481.88 and 403.36 is: 604.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.60 : 1,481.88 = 403.36 : x
  2. Step 2: Convert to fraction form
    988.60/1,481.88 = 403.36/x
  3. Step 3: Cross multiply
    988.60x = 1,481.88 × 403.36
  4. Step 4: Simplify right side
    988.60x = 597,731.12
  5. Step 5: Solve for x
    x = 597,731.12/988.60
  6. Step 6: Final answer
    x = 604.62

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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.