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Finding the Fourth Proportional to 85,115.10, 127,672.65 and 55,590.60

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Solution

The fourth proportional to 85,115.10, 127,672.65 and 55,590.60 is: 83,385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,115.10 : 127,672.65 = 55,590.60 : x
  2. Step 2: Convert to fraction form
    85,115.10/127,672.65 = 55,590.60/x
  3. Step 3: Cross multiply
    85,115.10x = 127,672.65 × 55,590.60
  4. Step 4: Simplify right side
    85,115.10x = 7,097,399,217.09
  5. Step 5: Solve for x
    x = 7,097,399,217.09/85,115.10
  6. Step 6: Final answer
    x = 83,385.90

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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.