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Finding the Fourth Proportional to 1,169.64, 1,614.12 and 645.72

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Solution

The fourth proportional to 1,169.64, 1,614.12 and 645.72 is: 891.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.64 : 1,614.12 = 645.72 : x
  2. Step 2: Convert to fraction form
    1,169.64/1,614.12 = 645.72/x
  3. Step 3: Cross multiply
    1,169.64x = 1,614.12 × 645.72
  4. Step 4: Simplify right side
    1,169.64x = 1,042,269.57
  5. Step 5: Solve for x
    x = 1,042,269.57/1,169.64
  6. Step 6: Final answer
    x = 891.10

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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.