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Finding the Fourth Proportional to 2,928.65, 4,392.05 and 980.39

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Solution

The fourth proportional to 2,928.65, 4,392.05 and 980.39 is: 1,470.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928.65 : 4,392.05 = 980.39 : x
  2. Step 2: Convert to fraction form
    2,928.65/4,392.05 = 980.39/x
  3. Step 3: Cross multiply
    2,928.65x = 4,392.05 × 980.39
  4. Step 4: Simplify right side
    2,928.65x = 4,305,927.98
  5. Step 5: Solve for x
    x = 4,305,927.98/2,928.65
  6. Step 6: Final answer
    x = 1,470.28

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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.