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Finding the Fourth Proportional to 85,020.60, 127,530.90 and 80,938.20

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Solution

The fourth proportional to 85,020.60, 127,530.90 and 80,938.20 is: 121,407.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,020.60 : 127,530.90 = 80,938.20 : x
  2. Step 2: Convert to fraction form
    85,020.60/127,530.90 = 80,938.20/x
  3. Step 3: Cross multiply
    85,020.60x = 127,530.90 × 80,938.20
  4. Step 4: Simplify right side
    85,020.60x = 10,322,121,490.38
  5. Step 5: Solve for x
    x = 10,322,121,490.38/85,020.60
  6. Step 6: Final answer
    x = 121,407.30

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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.