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Finding the Fourth Proportional to 85,411.69, 128,195.66 and 43,320.83

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Solution

The fourth proportional to 85,411.69, 128,195.66 and 43,320.83 is: 65,020.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,411.69 : 128,195.66 = 43,320.83 : x
  2. Step 2: Convert to fraction form
    85,411.69/128,195.66 = 43,320.83/x
  3. Step 3: Cross multiply
    85,411.69x = 128,195.66 × 43,320.83
  4. Step 4: Simplify right side
    85,411.69x = 5,553,542,176.99
  5. Step 5: Solve for x
    x = 5,553,542,176.99/85,411.69
  6. Step 6: Final answer
    x = 65,020.87

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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.