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Finding the Fourth Proportional to 85,843.10, 128,764.65 and 79,622.30

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Solution

The fourth proportional to 85,843.10, 128,764.65 and 79,622.30 is: 119,433.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,843.10 : 128,764.65 = 79,622.30 : x
  2. Step 2: Convert to fraction form
    85,843.10/128,764.65 = 79,622.30/x
  3. Step 3: Cross multiply
    85,843.10x = 128,764.65 × 79,622.30
  4. Step 4: Simplify right side
    85,843.10x = 10,252,537,591.70
  5. Step 5: Solve for x
    x = 10,252,537,591.70/85,843.10
  6. Step 6: Final answer
    x = 119,433.45

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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.