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Finding the Fourth Proportional to 987.56, 1,480.35 and 439.29

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Solution

The fourth proportional to 987.56, 1,480.35 and 439.29 is: 658.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.56 : 1,480.35 = 439.29 : x
  2. Step 2: Convert to fraction form
    987.56/1,480.35 = 439.29/x
  3. Step 3: Cross multiply
    987.56x = 1,480.35 × 439.29
  4. Step 4: Simplify right side
    987.56x = 650,302.95
  5. Step 5: Solve for x
    x = 650,302.95/987.56
  6. Step 6: Final answer
    x = 658.50

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Double scale
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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.