Home / 81,811.90-122,717.85-78,312.70

Finding the Fourth Proportional to 81,811.90, 122,717.85 and 78,312.70

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Solution

The fourth proportional to 81,811.90, 122,717.85 and 78,312.70 is: 117,469.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,811.90 : 122,717.85 = 78,312.70 : x
  2. Step 2: Convert to fraction form
    81,811.90/122,717.85 = 78,312.70/x
  3. Step 3: Cross multiply
    81,811.90x = 122,717.85 × 78,312.70
  4. Step 4: Simplify right side
    81,811.90x = 9,610,366,171.70
  5. Step 5: Solve for x
    x = 9,610,366,171.70/81,811.90
  6. Step 6: Final answer
    x = 117,469.05

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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.