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Finding the Fourth Proportional to 8,991.90, 12,408.86 and 5,217.30

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Solution

The fourth proportional to 8,991.90, 12,408.86 and 5,217.30 is: 7,199.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.90 : 12,408.86 = 5,217.30 : x
  2. Step 2: Convert to fraction form
    8,991.90/12,408.86 = 5,217.30/x
  3. Step 3: Cross multiply
    8,991.90x = 12,408.86 × 5,217.30
  4. Step 4: Simplify right side
    8,991.90x = 64,740,758.32
  5. Step 5: Solve for x
    x = 64,740,758.32/8,991.90
  6. Step 6: Final answer
    x = 7,199.90

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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.