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Finding the Fourth Proportional to 868.80, 1,302.99 and 321.05

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Solution

The fourth proportional to 868.80, 1,302.99 and 321.05 is: 481.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.80 : 1,302.99 = 321.05 : x
  2. Step 2: Convert to fraction form
    868.80/1,302.99 = 321.05/x
  3. Step 3: Cross multiply
    868.80x = 1,302.99 × 321.05
  4. Step 4: Simplify right side
    868.80x = 418,324.94
  5. Step 5: Solve for x
    x = 418,324.94/868.80
  6. Step 6: Final answer
    x = 481.50

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Double scale
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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.