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Finding the Fourth Proportional to 2,928.68, 4,391.76 and 980.36

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Solution

The fourth proportional to 2,928.68, 4,391.76 and 980.36 is: 1,470.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928.68 : 4,391.76 = 980.36 : x
  2. Step 2: Convert to fraction form
    2,928.68/4,391.76 = 980.36/x
  3. Step 3: Cross multiply
    2,928.68x = 4,391.76 × 980.36
  4. Step 4: Simplify right side
    2,928.68x = 4,305,505.83
  5. Step 5: Solve for x
    x = 4,305,505.83/2,928.68
  6. Step 6: Final answer
    x = 1,470.12

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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.