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Finding the Fourth Proportional to 3,321.29, 4,980.21 and 980.99

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Solution

The fourth proportional to 3,321.29, 4,980.21 and 980.99 is: 1,470.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,321.29 : 4,980.21 = 980.99 : x
  2. Step 2: Convert to fraction form
    3,321.29/4,980.21 = 980.99/x
  3. Step 3: Cross multiply
    3,321.29x = 4,980.21 × 980.99
  4. Step 4: Simplify right side
    3,321.29x = 4,885,526.30
  5. Step 5: Solve for x
    x = 4,885,526.30/3,321.29
  6. Step 6: Final answer
    x = 1,470.97

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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.