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Finding the Fourth Proportional to 81,818.77, 112,921.41 and 68,368.72

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Solution

The fourth proportional to 81,818.77, 112,921.41 and 68,368.72 is: 94,358.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,818.77 : 112,921.41 = 68,368.72 : x
  2. Step 2: Convert to fraction form
    81,818.77/112,921.41 = 68,368.72/x
  3. Step 3: Cross multiply
    81,818.77x = 112,921.41 × 68,368.72
  4. Step 4: Simplify right side
    81,818.77x = 7,720,292,262.30
  5. Step 5: Solve for x
    x = 7,720,292,262.30/81,818.77
  6. Step 6: Final answer
    x = 94,358.45

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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.