Home / 2,920.10-4,378.80-1,275.80

Finding the Fourth Proportional to 2,920.10, 4,378.80 and 1,275.80

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Solution

The fourth proportional to 2,920.10, 4,378.80 and 1,275.80 is: 1,913.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,920.10 : 4,378.80 = 1,275.80 : x
  2. Step 2: Convert to fraction form
    2,920.10/4,378.80 = 1,275.80/x
  3. Step 3: Cross multiply
    2,920.10x = 4,378.80 × 1,275.80
  4. Step 4: Simplify right side
    2,920.10x = 5,586,473.04
  5. Step 5: Solve for x
    x = 5,586,473.04/2,920.10
  6. Step 6: Final answer
    x = 1,913.11

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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.