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Finding the Fourth Proportional to 85,499.80, 128,249.70 and 80,907.10

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Solution

The fourth proportional to 85,499.80, 128,249.70 and 80,907.10 is: 121,360.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,499.80 : 128,249.70 = 80,907.10 : x
  2. Step 2: Convert to fraction form
    85,499.80/128,249.70 = 80,907.10/x
  3. Step 3: Cross multiply
    85,499.80x = 128,249.70 × 80,907.10
  4. Step 4: Simplify right side
    85,499.80x = 10,376,311,302.87
  5. Step 5: Solve for x
    x = 10,376,311,302.87/85,499.80
  6. Step 6: Final answer
    x = 121,360.65

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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.