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Finding the Fourth Proportional to 987.77, 1,481.04 and 680

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Solution

The fourth proportional to 987.77, 1,481.04 and 680 is: 1,019.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.77 : 1,481.04 = 680 : x
  2. Step 2: Convert to fraction form
    987.77/1,481.04 = 680/x
  3. Step 3: Cross multiply
    987.77x = 1,481.04 × 680
  4. Step 4: Simplify right side
    987.77x = 1,007,107.20
  5. Step 5: Solve for x
    x = 1,007,107.20/987.77
  6. Step 6: Final answer
    x = 1,019.58

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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.