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Finding the Fourth Proportional to 8,685, 11,982.42 and 5,542.20

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Solution

The fourth proportional to 8,685, 11,982.42 and 5,542.20 is: 7,646.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685 : 11,982.42 = 5,542.20 : x
  2. Step 2: Convert to fraction form
    8,685/11,982.42 = 5,542.20/x
  3. Step 3: Cross multiply
    8,685x = 11,982.42 × 5,542.20
  4. Step 4: Simplify right side
    8,685x = 66,408,968.12
  5. Step 5: Solve for x
    x = 66,408,968.12/8,685
  6. Step 6: Final answer
    x = 7,646.40

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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.