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Finding the Fourth Proportional to 1,909.47, 2,861.81 and 869.16

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Solution

The fourth proportional to 1,909.47, 2,861.81 and 869.16 is: 1,302.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,909.47 : 2,861.81 = 869.16 : x
  2. Step 2: Convert to fraction form
    1,909.47/2,861.81 = 869.16/x
  3. Step 3: Cross multiply
    1,909.47x = 2,861.81 × 869.16
  4. Step 4: Simplify right side
    1,909.47x = 2,487,370.78
  5. Step 5: Solve for x
    x = 2,487,370.78/1,909.47
  6. Step 6: Final answer
    x = 1,302.65

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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.