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Finding the Fourth Proportional to 1,439.80, 2,158.98 and 515.22

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Solution

The fourth proportional to 1,439.80, 2,158.98 and 515.22 is: 772.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,439.80 : 2,158.98 = 515.22 : x
  2. Step 2: Convert to fraction form
    1,439.80/2,158.98 = 515.22/x
  3. Step 3: Cross multiply
    1,439.80x = 2,158.98 × 515.22
  4. Step 4: Simplify right side
    1,439.80x = 1,112,349.68
  5. Step 5: Solve for x
    x = 1,112,349.68/1,439.80
  6. Step 6: Final answer
    x = 772.57

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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.