Home / 1,425.18-2,138.58-878.70

Finding the Fourth Proportional to 1,425.18, 2,138.58 and 878.70

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Solution

The fourth proportional to 1,425.18, 2,138.58 and 878.70 is: 1,318.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.18 : 2,138.58 = 878.70 : x
  2. Step 2: Convert to fraction form
    1,425.18/2,138.58 = 878.70/x
  3. Step 3: Cross multiply
    1,425.18x = 2,138.58 × 878.70
  4. Step 4: Simplify right side
    1,425.18x = 1,879,170.25
  5. Step 5: Solve for x
    x = 1,879,170.25/1,425.18
  6. Step 6: Final answer
    x = 1,318.55

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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.