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Finding the Fourth Proportional to 85,718.70, 128,493 and 43,473.15

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Solution

The fourth proportional to 85,718.70, 128,493 and 43,473.15 is: 65,166.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,718.70 : 128,493 = 43,473.15 : x
  2. Step 2: Convert to fraction form
    85,718.70/128,493 = 43,473.15/x
  3. Step 3: Cross multiply
    85,718.70x = 128,493 × 43,473.15
  4. Step 4: Simplify right side
    85,718.70x = 5,585,995,462.95
  5. Step 5: Solve for x
    x = 5,585,995,462.95/85,718.70
  6. Step 6: Final answer
    x = 65,166.59

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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.