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Finding the Fourth Proportional to 80,950.90, 111,706.98 and 45,138.79

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Solution

The fourth proportional to 80,950.90, 111,706.98 and 45,138.79 is: 62,288.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,950.90 : 111,706.98 = 45,138.79 : x
  2. Step 2: Convert to fraction form
    80,950.90/111,706.98 = 45,138.79/x
  3. Step 3: Cross multiply
    80,950.90x = 111,706.98 × 45,138.79
  4. Step 4: Simplify right side
    80,950.90x = 5,042,317,911.75
  5. Step 5: Solve for x
    x = 5,042,317,911.75/80,950.90
  6. Step 6: Final answer
    x = 62,288.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.