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Finding the Fourth Proportional to 987.62, 1,481.46 and 756.93

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Solution

The fourth proportional to 987.62, 1,481.46 and 756.93 is: 1,135.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.62 : 1,481.46 = 756.93 : x
  2. Step 2: Convert to fraction form
    987.62/1,481.46 = 756.93/x
  3. Step 3: Cross multiply
    987.62x = 1,481.46 × 756.93
  4. Step 4: Simplify right side
    987.62x = 1,121,361.52
  5. Step 5: Solve for x
    x = 1,121,361.52/987.62
  6. Step 6: Final answer
    x = 1,135.42

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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.