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Finding the Fourth Proportional to 85,912.65, 128,866.14 and 35,309.93

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Solution

The fourth proportional to 85,912.65, 128,866.14 and 35,309.93 is: 52,963.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.65 : 128,866.14 = 35,309.93 : x
  2. Step 2: Convert to fraction form
    85,912.65/128,866.14 = 35,309.93/x
  3. Step 3: Cross multiply
    85,912.65x = 128,866.14 × 35,309.93
  4. Step 4: Simplify right side
    85,912.65x = 4,550,253,738.44
  5. Step 5: Solve for x
    x = 4,550,253,738.44/85,912.65
  6. Step 6: Final answer
    x = 52,963.72

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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.