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Finding the Fourth Proportional to 987.36, 1,481.52 and 771.36

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Solution

The fourth proportional to 987.36, 1,481.52 and 771.36 is: 1,157.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    987.36 : 1,481.52 = 771.36 : x
  2. Step 2: Convert to fraction form
    987.36/1,481.52 = 771.36/x
  3. Step 3: Cross multiply
    987.36x = 1,481.52 × 771.36
  4. Step 4: Simplify right side
    987.36x = 1,142,785.27
  5. Step 5: Solve for x
    x = 1,142,785.27/987.36
  6. Step 6: Final answer
    x = 1,157.41

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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.