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Finding the Fourth Proportional to 85,940.40, 128,910.60 and 81,019.65

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Solution

The fourth proportional to 85,940.40, 128,910.60 and 81,019.65 is: 121,529.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,940.40 : 128,910.60 = 81,019.65 : x
  2. Step 2: Convert to fraction form
    85,940.40/128,910.60 = 81,019.65/x
  3. Step 3: Cross multiply
    85,940.40x = 128,910.60 × 81,019.65
  4. Step 4: Simplify right side
    85,940.40x = 10,444,291,693.29
  5. Step 5: Solve for x
    x = 10,444,291,693.29/85,940.40
  6. Step 6: Final answer
    x = 121,529.48

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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.