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Finding the Fourth Proportional to 9,920.85, 13,691.20 and 5,941.20

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Solution

The fourth proportional to 9,920.85, 13,691.20 and 5,941.20 is: 8,199.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,920.85 : 13,691.20 = 5,941.20 : x
  2. Step 2: Convert to fraction form
    9,920.85/13,691.20 = 5,941.20/x
  3. Step 3: Cross multiply
    9,920.85x = 13,691.20 × 5,941.20
  4. Step 4: Simplify right side
    9,920.85x = 81,342,157.44
  5. Step 5: Solve for x
    x = 81,342,157.44/9,920.85
  6. Step 6: Final answer
    x = 8,199.11

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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.