Home / 2,117.20-2,921.92-1,278.16

Finding the Fourth Proportional to 2,117.20, 2,921.92 and 1,278.16

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Solution

The fourth proportional to 2,117.20, 2,921.92 and 1,278.16 is: 1,763.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.20 : 2,921.92 = 1,278.16 : x
  2. Step 2: Convert to fraction form
    2,117.20/2,921.92 = 1,278.16/x
  3. Step 3: Cross multiply
    2,117.20x = 2,921.92 × 1,278.16
  4. Step 4: Simplify right side
    2,117.20x = 3,734,681.27
  5. Step 5: Solve for x
    x = 3,734,681.27/2,117.20
  6. Step 6: Final answer
    x = 1,763.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.