Home / 1,518.80-2,278.20-862.70

Finding the Fourth Proportional to 1,518.80, 2,278.20 and 862.70

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Solution

The fourth proportional to 1,518.80, 2,278.20 and 862.70 is: 1,294.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,518.80 : 2,278.20 = 862.70 : x
  2. Step 2: Convert to fraction form
    1,518.80/2,278.20 = 862.70/x
  3. Step 3: Cross multiply
    1,518.80x = 2,278.20 × 862.70
  4. Step 4: Simplify right side
    1,518.80x = 1,965,403.14
  5. Step 5: Solve for x
    x = 1,965,403.14/1,518.80
  6. Step 6: Final answer
    x = 1,294.05

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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.