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Finding the Fourth Proportional to 2,612.80, 3,928.80 and 2,190.40

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Solution

The fourth proportional to 2,612.80, 3,928.80 and 2,190.40 is: 3,293.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,612.80 : 3,928.80 = 2,190.40 : x
  2. Step 2: Convert to fraction form
    2,612.80/3,928.80 = 2,190.40/x
  3. Step 3: Cross multiply
    2,612.80x = 3,928.80 × 2,190.40
  4. Step 4: Simplify right side
    2,612.80x = 8,605,643.52
  5. Step 5: Solve for x
    x = 8,605,643.52/2,612.80
  6. Step 6: Final answer
    x = 3,293.65

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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.