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Finding the Fourth Proportional to 80,787.61, 121,074.49 and 61,995.84

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Solution

The fourth proportional to 80,787.61, 121,074.49 and 61,995.84 is: 92,911.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,787.61 : 121,074.49 = 61,995.84 : x
  2. Step 2: Convert to fraction form
    80,787.61/121,074.49 = 61,995.84/x
  3. Step 3: Cross multiply
    80,787.61x = 121,074.49 × 61,995.84
  4. Step 4: Simplify right side
    80,787.61x = 7,506,114,710.12
  5. Step 5: Solve for x
    x = 7,506,114,710.12/80,787.61
  6. Step 6: Final answer
    x = 92,911.71

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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.