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Finding the Fourth Proportional to 987.36, 1,479.64 and 871.56

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Solution

The fourth proportional to 987.36, 1,479.64 and 871.56 is: 1,306.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.36 : 1,479.64 = 871.56 : x
  2. Step 2: Convert to fraction form
    987.36/1,479.64 = 871.56/x
  3. Step 3: Cross multiply
    987.36x = 1,479.64 × 871.56
  4. Step 4: Simplify right side
    987.36x = 1,289,595.04
  5. Step 5: Solve for x
    x = 1,289,595.04/987.36
  6. Step 6: Final answer
    x = 1,306.10

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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.