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Finding the Fourth Proportional to 81,444.60, 122,021.10 and 69,780.60

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Solution

The fourth proportional to 81,444.60, 122,021.10 and 69,780.60 is: 104,545.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,444.60 : 122,021.10 = 69,780.60 : x
  2. Step 2: Convert to fraction form
    81,444.60/122,021.10 = 69,780.60/x
  3. Step 3: Cross multiply
    81,444.60x = 122,021.10 × 69,780.60
  4. Step 4: Simplify right side
    81,444.60x = 8,514,705,570.66
  5. Step 5: Solve for x
    x = 8,514,705,570.66/81,444.60
  6. Step 6: Final answer
    x = 104,545.98

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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.