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Finding the Fourth Proportional to 81,858.74, 112,641.45 and 68,386.82

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Solution

The fourth proportional to 81,858.74, 112,641.45 and 68,386.82 is: 94,103.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,858.74 : 112,641.45 = 68,386.82 : x
  2. Step 2: Convert to fraction form
    81,858.74/112,641.45 = 68,386.82/x
  3. Step 3: Cross multiply
    81,858.74x = 112,641.45 × 68,386.82
  4. Step 4: Simplify right side
    81,858.74x = 7,703,190,565.69
  5. Step 5: Solve for x
    x = 7,703,190,565.69/81,858.74
  6. Step 6: Final answer
    x = 94,103.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.