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Finding the Fourth Proportional to 81,856.80, 123,076.80 and 69,026.40

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Solution

The fourth proportional to 81,856.80, 123,076.80 and 69,026.40 is: 103,785.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,856.80 : 123,076.80 = 69,026.40 : x
  2. Step 2: Convert to fraction form
    81,856.80/123,076.80 = 69,026.40/x
  3. Step 3: Cross multiply
    81,856.80x = 123,076.80 × 69,026.40
  4. Step 4: Simplify right side
    81,856.80x = 8,495,548,427.52
  5. Step 5: Solve for x
    x = 8,495,548,427.52/81,856.80
  6. Step 6: Final answer
    x = 103,785.49

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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.