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Finding the Fourth Proportional to 2,928, 4,391.50 and 980.20

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Solution

The fourth proportional to 2,928, 4,391.50 and 980.20 is: 1,470.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,928 : 4,391.50 = 980.20 : x
  2. Step 2: Convert to fraction form
    2,928/4,391.50 = 980.20/x
  3. Step 3: Cross multiply
    2,928x = 4,391.50 × 980.20
  4. Step 4: Simplify right side
    2,928x = 4,304,548.30
  5. Step 5: Solve for x
    x = 4,304,548.30/2,928
  6. Step 6: Final answer
    x = 1,470.13

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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.