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Finding the Fourth Proportional to 7,020.80, 10,531.20 and 5,740.80

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Solution

The fourth proportional to 7,020.80, 10,531.20 and 5,740.80 is: 8,611.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,020.80 : 10,531.20 = 5,740.80 : x
  2. Step 2: Convert to fraction form
    7,020.80/10,531.20 = 5,740.80/x
  3. Step 3: Cross multiply
    7,020.80x = 10,531.20 × 5,740.80
  4. Step 4: Simplify right side
    7,020.80x = 60,457,512.96
  5. Step 5: Solve for x
    x = 60,457,512.96/7,020.80
  6. Step 6: Final answer
    x = 8,611.20

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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.