Home / 77,687.40-115,961.72-71,981.83

Finding the Fourth Proportional to 77,687.40, 115,961.72 and 71,981.83

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Solution

The fourth proportional to 77,687.40, 115,961.72 and 71,981.83 is: 107,445.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,687.40 : 115,961.72 = 71,981.83 : x
  2. Step 2: Convert to fraction form
    77,687.40/115,961.72 = 71,981.83/x
  3. Step 3: Cross multiply
    77,687.40x = 115,961.72 × 71,981.83
  4. Step 4: Simplify right side
    77,687.40x = 8,347,136,165.73
  5. Step 5: Solve for x
    x = 8,347,136,165.73/77,687.40
  6. Step 6: Final answer
    x = 107,445.17

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.