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Finding the Fourth Proportional to 1,209.72, 1,815.03 and 689.40

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Solution

The fourth proportional to 1,209.72, 1,815.03 and 689.40 is: 1,034.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,209.72 : 1,815.03 = 689.40 : x
  2. Step 2: Convert to fraction form
    1,209.72/1,815.03 = 689.40/x
  3. Step 3: Cross multiply
    1,209.72x = 1,815.03 × 689.40
  4. Step 4: Simplify right side
    1,209.72x = 1,251,281.68
  5. Step 5: Solve for x
    x = 1,251,281.68/1,209.72
  6. Step 6: Final answer
    x = 1,034.36

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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.