Home / 2,920.75-4,378.82-1,686.78

Finding the Fourth Proportional to 2,920.75, 4,378.82 and 1,686.78

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Solution

The fourth proportional to 2,920.75, 4,378.82 and 1,686.78 is: 2,528.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.75 : 4,378.82 = 1,686.78 : x
  2. Step 2: Convert to fraction form
    2,920.75/4,378.82 = 1,686.78/x
  3. Step 3: Cross multiply
    2,920.75x = 4,378.82 × 1,686.78
  4. Step 4: Simplify right side
    2,920.75x = 7,386,097.57
  5. Step 5: Solve for x
    x = 7,386,097.57/2,920.75
  6. Step 6: Final answer
    x = 2,528.84

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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.