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Finding the Fourth Proportional to 2,928.29, 4,392.63 and 980.51

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Solution

The fourth proportional to 2,928.29, 4,392.63 and 980.51 is: 1,470.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928.29 : 4,392.63 = 980.51 : x
  2. Step 2: Convert to fraction form
    2,928.29/4,392.63 = 980.51/x
  3. Step 3: Cross multiply
    2,928.29x = 4,392.63 × 980.51
  4. Step 4: Simplify right side
    2,928.29x = 4,306,995.68
  5. Step 5: Solve for x
    x = 4,306,995.68/2,928.29
  6. Step 6: Final answer
    x = 1,470.83

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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.