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Finding the Fourth Proportional to 79,981.70, 119,972.55 and 78,815.30

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Solution

The fourth proportional to 79,981.70, 119,972.55 and 78,815.30 is: 118,222.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,981.70 : 119,972.55 = 78,815.30 : x
  2. Step 2: Convert to fraction form
    79,981.70/119,972.55 = 78,815.30/x
  3. Step 3: Cross multiply
    79,981.70x = 119,972.55 × 78,815.30
  4. Step 4: Simplify right side
    79,981.70x = 9,455,672,520.02
  5. Step 5: Solve for x
    x = 9,455,672,520.02/79,981.70
  6. Step 6: Final answer
    x = 118,222.95

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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.