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Finding the Fourth Proportional to 2,861.66, 4,292.36 and 781.66

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Solution

The fourth proportional to 2,861.66, 4,292.36 and 781.66 is: 1,172.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,861.66 : 4,292.36 = 781.66 : x
  2. Step 2: Convert to fraction form
    2,861.66/4,292.36 = 781.66/x
  3. Step 3: Cross multiply
    2,861.66x = 4,292.36 × 781.66
  4. Step 4: Simplify right side
    2,861.66x = 3,355,140.75
  5. Step 5: Solve for x
    x = 3,355,140.75/2,861.66
  6. Step 6: Final answer
    x = 1,172.45

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1.5x scale

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.