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Finding the Fourth Proportional to 6,871.69, 9,479.82 and 4,218.13

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Solution

The fourth proportional to 6,871.69, 9,479.82 and 4,218.13 is: 5,819.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,871.69 : 9,479.82 = 4,218.13 : x
  2. Step 2: Convert to fraction form
    6,871.69/9,479.82 = 4,218.13/x
  3. Step 3: Cross multiply
    6,871.69x = 9,479.82 × 4,218.13
  4. Step 4: Simplify right side
    6,871.69x = 39,987,113.14
  5. Step 5: Solve for x
    x = 39,987,113.14/6,871.69
  6. Step 6: Final answer
    x = 5,819.11

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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.