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Finding the Fourth Proportional to 1,209.52, 1,665.66 and 987.04

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Solution

The fourth proportional to 1,209.52, 1,665.66 and 987.04 is: 1,359.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.52 : 1,665.66 = 987.04 : x
  2. Step 2: Convert to fraction form
    1,209.52/1,665.66 = 987.04/x
  3. Step 3: Cross multiply
    1,209.52x = 1,665.66 × 987.04
  4. Step 4: Simplify right side
    1,209.52x = 1,644,073.05
  5. Step 5: Solve for x
    x = 1,644,073.05/1,209.52
  6. Step 6: Final answer
    x = 1,359.28

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.