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Finding the Fourth Proportional to 80,687.93, 121,011.30 and 57,215.93

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Solution

The fourth proportional to 80,687.93, 121,011.30 and 57,215.93 is: 85,809.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,687.93 : 121,011.30 = 57,215.93 : x
  2. Step 2: Convert to fraction form
    80,687.93/121,011.30 = 57,215.93/x
  3. Step 3: Cross multiply
    80,687.93x = 121,011.30 × 57,215.93
  4. Step 4: Simplify right side
    80,687.93x = 6,923,773,464.95
  5. Step 5: Solve for x
    x = 6,923,773,464.95/80,687.93
  6. Step 6: Final answer
    x = 85,809.29

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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.