Home / 2,319.40-3,478.70-857.80

Finding the Fourth Proportional to 2,319.40, 3,478.70 and 857.80

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Solution

The fourth proportional to 2,319.40, 3,478.70 and 857.80 is: 1,286.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,319.40 : 3,478.70 = 857.80 : x
  2. Step 2: Convert to fraction form
    2,319.40/3,478.70 = 857.80/x
  3. Step 3: Cross multiply
    2,319.40x = 3,478.70 × 857.80
  4. Step 4: Simplify right side
    2,319.40x = 2,984,028.86
  5. Step 5: Solve for x
    x = 2,984,028.86/2,319.40
  6. Step 6: Final answer
    x = 1,286.55

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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.