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Finding the Fourth Proportional to 7,443.20, 11,164.80 and 7,078.70

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Solution

The fourth proportional to 7,443.20, 11,164.80 and 7,078.70 is: 10,618.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,443.20 : 11,164.80 = 7,078.70 : x
  2. Step 2: Convert to fraction form
    7,443.20/11,164.80 = 7,078.70/x
  3. Step 3: Cross multiply
    7,443.20x = 11,164.80 × 7,078.70
  4. Step 4: Simplify right side
    7,443.20x = 79,032,269.76
  5. Step 5: Solve for x
    x = 79,032,269.76/7,443.20
  6. Step 6: Final answer
    x = 10,618.05

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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.