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Finding the Fourth Proportional to 80,681.80, 121,026.66 and 21,518

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Solution

The fourth proportional to 80,681.80, 121,026.66 and 21,518 is: 32,278.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,681.80 : 121,026.66 = 21,518 : x
  2. Step 2: Convert to fraction form
    80,681.80/121,026.66 = 21,518/x
  3. Step 3: Cross multiply
    80,681.80x = 121,026.66 × 21,518
  4. Step 4: Simplify right side
    80,681.80x = 2,604,251,669.88
  5. Step 5: Solve for x
    x = 2,604,251,669.88/80,681.80
  6. Step 6: Final answer
    x = 32,278.06

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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.