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Finding the Fourth Proportional to 85,768.78, 128,655.69 and 73,209.61

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Solution

The fourth proportional to 85,768.78, 128,655.69 and 73,209.61 is: 109,816.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,768.78 : 128,655.69 = 73,209.61 : x
  2. Step 2: Convert to fraction form
    85,768.78/128,655.69 = 73,209.61/x
  3. Step 3: Cross multiply
    85,768.78x = 128,655.69 × 73,209.61
  4. Step 4: Simplify right side
    85,768.78x = 9,418,832,889.18
  5. Step 5: Solve for x
    x = 9,418,832,889.18/85,768.78
  6. Step 6: Final answer
    x = 109,816.57

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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.