Home / 7,528.20-10,388.40-4,170.78

Finding the Fourth Proportional to 7,528.20, 10,388.40 and 4,170.78

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Solution

The fourth proportional to 7,528.20, 10,388.40 and 4,170.78 is: 5,755.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,528.20 : 10,388.40 = 4,170.78 : x
  2. Step 2: Convert to fraction form
    7,528.20/10,388.40 = 4,170.78/x
  3. Step 3: Cross multiply
    7,528.20x = 10,388.40 × 4,170.78
  4. Step 4: Simplify right side
    7,528.20x = 43,327,730.95
  5. Step 5: Solve for x
    x = 43,327,730.95/7,528.20
  6. Step 6: Final answer
    x = 5,755.39

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Half scale
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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.