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Finding the Fourth Proportional to 2,861.66, 4,292.87 and 781.74

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Solution

The fourth proportional to 2,861.66, 4,292.87 and 781.74 is: 1,172.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.66 : 4,292.87 = 781.74 : x
  2. Step 2: Convert to fraction form
    2,861.66/4,292.87 = 781.74/x
  3. Step 3: Cross multiply
    2,861.66x = 4,292.87 × 781.74
  4. Step 4: Simplify right side
    2,861.66x = 3,355,904.29
  5. Step 5: Solve for x
    x = 3,355,904.29/2,861.66
  6. Step 6: Final answer
    x = 1,172.71

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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.