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Finding the Fourth Proportional to 86,079.39, 128,879.58 and 43,868.46

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Solution

The fourth proportional to 86,079.39, 128,879.58 and 43,868.46 is: 65,680.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,079.39 : 128,879.58 = 43,868.46 : x
  2. Step 2: Convert to fraction form
    86,079.39/128,879.58 = 43,868.46/x
  3. Step 3: Cross multiply
    86,079.39x = 128,879.58 × 43,868.46
  4. Step 4: Simplify right side
    86,079.39x = 5,653,748,700.05
  5. Step 5: Solve for x
    x = 5,653,748,700.05/86,079.39
  6. Step 6: Final answer
    x = 65,680.63

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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.