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Finding the Fourth Proportional to 987.90, 1,480.44 and 725.85

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Solution

The fourth proportional to 987.90, 1,480.44 and 725.85 is: 1,087.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.90 : 1,480.44 = 725.85 : x
  2. Step 2: Convert to fraction form
    987.90/1,480.44 = 725.85/x
  3. Step 3: Cross multiply
    987.90x = 1,480.44 × 725.85
  4. Step 4: Simplify right side
    987.90x = 1,074,577.37
  5. Step 5: Solve for x
    x = 1,074,577.37/987.90
  6. Step 6: Final answer
    x = 1,087.74

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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.