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Finding the Fourth Proportional to 2,540.32, 3,809.70 and 980.20

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Solution

The fourth proportional to 2,540.32, 3,809.70 and 980.20 is: 1,470.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,540.32 : 3,809.70 = 980.20 : x
  2. Step 2: Convert to fraction form
    2,540.32/3,809.70 = 980.20/x
  3. Step 3: Cross multiply
    2,540.32x = 3,809.70 × 980.20
  4. Step 4: Simplify right side
    2,540.32x = 3,734,267.94
  5. Step 5: Solve for x
    x = 3,734,267.94/2,540.32
  6. Step 6: Final answer
    x = 1,470.00

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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.