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Finding the Fourth Proportional to 80,643.96, 120,968.67 and 28,053.90

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Solution

The fourth proportional to 80,643.96, 120,968.67 and 28,053.90 is: 42,081.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,643.96 : 120,968.67 = 28,053.90 : x
  2. Step 2: Convert to fraction form
    80,643.96/120,968.67 = 28,053.90/x
  3. Step 3: Cross multiply
    80,643.96x = 120,968.67 × 28,053.90
  4. Step 4: Simplify right side
    80,643.96x = 3,393,642,971.31
  5. Step 5: Solve for x
    x = 3,393,642,971.31/80,643.96
  6. Step 6: Final answer
    x = 42,081.80

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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.