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Finding the Fourth Proportional to 85,693.80, 128,540.70 and 85,110.60

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Solution

The fourth proportional to 85,693.80, 128,540.70 and 85,110.60 is: 127,665.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,693.80 : 128,540.70 = 85,110.60 : x
  2. Step 2: Convert to fraction form
    85,693.80/128,540.70 = 85,110.60/x
  3. Step 3: Cross multiply
    85,693.80x = 128,540.70 × 85,110.60
  4. Step 4: Simplify right side
    85,693.80x = 10,940,176,101.42
  5. Step 5: Solve for x
    x = 10,940,176,101.42/85,693.80
  6. Step 6: Final answer
    x = 127,665.90

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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.