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Finding the Fourth Proportional to 1,169.09, 1,613.34 and 645.15

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Solution

The fourth proportional to 1,169.09, 1,613.34 and 645.15 is: 890.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,169.09 : 1,613.34 = 645.15 : x
  2. Step 2: Convert to fraction form
    1,169.09/1,613.34 = 645.15/x
  3. Step 3: Cross multiply
    1,169.09x = 1,613.34 × 645.15
  4. Step 4: Simplify right side
    1,169.09x = 1,040,846.30
  5. Step 5: Solve for x
    x = 1,040,846.30/1,169.09
  6. Step 6: Final answer
    x = 890.30

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1.5x scale

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.