Home / 3,187.20-4,780.80-878.70

Finding the Fourth Proportional to 3,187.20, 4,780.80 and 878.70

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Solution

The fourth proportional to 3,187.20, 4,780.80 and 878.70 is: 1,318.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,187.20 : 4,780.80 = 878.70 : x
  2. Step 2: Convert to fraction form
    3,187.20/4,780.80 = 878.70/x
  3. Step 3: Cross multiply
    3,187.20x = 4,780.80 × 878.70
  4. Step 4: Simplify right side
    3,187.20x = 4,200,888.96
  5. Step 5: Solve for x
    x = 4,200,888.96/3,187.20
  6. Step 6: Final answer
    x = 1,318.05

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1.5x scale

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.