Home / 1,285.20-1,926.51-418.86

Finding the Fourth Proportional to 1,285.20, 1,926.51 and 418.86

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Solution

The fourth proportional to 1,285.20, 1,926.51 and 418.86 is: 627.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,285.20 : 1,926.51 = 418.86 : x
  2. Step 2: Convert to fraction form
    1,285.20/1,926.51 = 418.86/x
  3. Step 3: Cross multiply
    1,285.20x = 1,926.51 × 418.86
  4. Step 4: Simplify right side
    1,285.20x = 806,937.98
  5. Step 5: Solve for x
    x = 806,937.98/1,285.20
  6. Step 6: Final answer
    x = 627.87

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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.