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Finding the Fourth Proportional to 8,763.90, 13,147.95 and 2,920.56

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Solution

The fourth proportional to 8,763.90, 13,147.95 and 2,920.56 is: 4,381.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,763.90 : 13,147.95 = 2,920.56 : x
  2. Step 2: Convert to fraction form
    8,763.90/13,147.95 = 2,920.56/x
  3. Step 3: Cross multiply
    8,763.90x = 13,147.95 × 2,920.56
  4. Step 4: Simplify right side
    8,763.90x = 38,399,376.85
  5. Step 5: Solve for x
    x = 38,399,376.85/8,763.90
  6. Step 6: Final answer
    x = 4,381.54

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Double scale
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Similar ratio
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1.5x scale

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.