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Finding the Fourth Proportional to 68,810.31, 103,117.80 and 28,786.16

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Solution

The fourth proportional to 68,810.31, 103,117.80 and 28,786.16 is: 43,138.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,810.31 : 103,117.80 = 28,786.16 : x
  2. Step 2: Convert to fraction form
    68,810.31/103,117.80 = 28,786.16/x
  3. Step 3: Cross multiply
    68,810.31x = 103,117.80 × 28,786.16
  4. Step 4: Simplify right side
    68,810.31x = 2,968,365,489.65
  5. Step 5: Solve for x
    x = 2,968,365,489.65/68,810.31
  6. Step 6: Final answer
    x = 43,138.38

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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.