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Finding the Fourth Proportional to 8,991.70, 12,408.66 and 5,215.03

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Solution

The fourth proportional to 8,991.70, 12,408.66 and 5,215.03 is: 7,196.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.70 : 12,408.66 = 5,215.03 : x
  2. Step 2: Convert to fraction form
    8,991.70/12,408.66 = 5,215.03/x
  3. Step 3: Cross multiply
    8,991.70x = 12,408.66 × 5,215.03
  4. Step 4: Simplify right side
    8,991.70x = 64,711,505.41
  5. Step 5: Solve for x
    x = 64,711,505.41/8,991.70
  6. Step 6: Final answer
    x = 7,196.80

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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.