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Finding the Fourth Proportional to 1,295.10, 1,942.72 and 987.44

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Solution

The fourth proportional to 1,295.10, 1,942.72 and 987.44 is: 1,481.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,295.10 : 1,942.72 = 987.44 : x
  2. Step 2: Convert to fraction form
    1,295.10/1,942.72 = 987.44/x
  3. Step 3: Cross multiply
    1,295.10x = 1,942.72 × 987.44
  4. Step 4: Simplify right side
    1,295.10x = 1,918,319.44
  5. Step 5: Solve for x
    x = 1,918,319.44/1,295.10
  6. Step 6: Final answer
    x = 1,481.21

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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.