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Finding the Fourth Proportional to 7,680.80, 11,521.20 and 7,389.20

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Solution

The fourth proportional to 7,680.80, 11,521.20 and 7,389.20 is: 11,083.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.80 : 11,521.20 = 7,389.20 : x
  2. Step 2: Convert to fraction form
    7,680.80/11,521.20 = 7,389.20/x
  3. Step 3: Cross multiply
    7,680.80x = 11,521.20 × 7,389.20
  4. Step 4: Simplify right side
    7,680.80x = 85,132,451.04
  5. Step 5: Solve for x
    x = 85,132,451.04/7,680.80
  6. Step 6: Final answer
    x = 11,083.80

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Half scale
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Double scale
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Similar ratio
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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.