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Finding the Fourth Proportional to 8,965.80, 13,391.33 and 8,120.23

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Solution

The fourth proportional to 8,965.80, 13,391.33 and 8,120.23 is: 12,128.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,965.80 : 13,391.33 = 8,120.23 : x
  2. Step 2: Convert to fraction form
    8,965.80/13,391.33 = 8,120.23/x
  3. Step 3: Cross multiply
    8,965.80x = 13,391.33 × 8,120.23
  4. Step 4: Simplify right side
    8,965.80x = 108,740,605.53
  5. Step 5: Solve for x
    x = 108,740,605.53/8,965.80
  6. Step 6: Final answer
    x = 12,128.38

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1.5x scale

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.