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Finding the Fourth Proportional to 988.14, 1,481.31 and 440.58

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Solution

The fourth proportional to 988.14, 1,481.31 and 440.58 is: 660.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.14 : 1,481.31 = 440.58 : x
  2. Step 2: Convert to fraction form
    988.14/1,481.31 = 440.58/x
  3. Step 3: Cross multiply
    988.14x = 1,481.31 × 440.58
  4. Step 4: Simplify right side
    988.14x = 652,635.56
  5. Step 5: Solve for x
    x = 652,635.56/988.14
  6. Step 6: Final answer
    x = 660.47

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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.