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Finding the Fourth Proportional to 7,503.70, 11,255.55 and 7,139.20

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Solution

The fourth proportional to 7,503.70, 11,255.55 and 7,139.20 is: 10,708.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,503.70 : 11,255.55 = 7,139.20 : x
  2. Step 2: Convert to fraction form
    7,503.70/11,255.55 = 7,139.20/x
  3. Step 3: Cross multiply
    7,503.70x = 11,255.55 × 7,139.20
  4. Step 4: Simplify right side
    7,503.70x = 80,355,622.56
  5. Step 5: Solve for x
    x = 80,355,622.56/7,503.70
  6. Step 6: Final answer
    x = 10,708.80

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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.