Home / 1,245.71-1,869.17-515.90

Finding the Fourth Proportional to 1,245.71, 1,869.17 and 515.90

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Solution

The fourth proportional to 1,245.71, 1,869.17 and 515.90 is: 774.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.71 : 1,869.17 = 515.90 : x
  2. Step 2: Convert to fraction form
    1,245.71/1,869.17 = 515.90/x
  3. Step 3: Cross multiply
    1,245.71x = 1,869.17 × 515.90
  4. Step 4: Simplify right side
    1,245.71x = 964,292.88
  5. Step 5: Solve for x
    x = 964,292.88/1,245.71
  6. Step 6: Final answer
    x = 774.09

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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.