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Finding the Fourth Proportional to 68,810.81, 103,118.55 and 28,786.66

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Solution

The fourth proportional to 68,810.81, 103,118.55 and 28,786.66 is: 43,139.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,810.81 : 103,118.55 = 28,786.66 : x
  2. Step 2: Convert to fraction form
    68,810.81/103,118.55 = 28,786.66/x
  3. Step 3: Cross multiply
    68,810.81x = 103,118.55 × 28,786.66
  4. Step 4: Simplify right side
    68,810.81x = 2,968,438,638.54
  5. Step 5: Solve for x
    x = 2,968,438,638.54/68,810.81
  6. Step 6: Final answer
    x = 43,139.13

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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.