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Finding the Fourth Proportional to 8,741.72, 12,069.16 and 6,721.22

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Solution

The fourth proportional to 8,741.72, 12,069.16 and 6,721.22 is: 9,279.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,741.72 : 12,069.16 = 6,721.22 : x
  2. Step 2: Convert to fraction form
    8,741.72/12,069.16 = 6,721.22/x
  3. Step 3: Cross multiply
    8,741.72x = 12,069.16 × 6,721.22
  4. Step 4: Simplify right side
    8,741.72x = 81,119,479.58
  5. Step 5: Solve for x
    x = 81,119,479.58/8,741.72
  6. Step 6: Final answer
    x = 9,279.58

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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.