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Finding the Fourth Proportional to 8,421.21, 12,631.85 and 8,218.23

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Solution

The fourth proportional to 8,421.21, 12,631.85 and 8,218.23 is: 12,327.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.21 : 12,631.85 = 8,218.23 : x
  2. Step 2: Convert to fraction form
    8,421.21/12,631.85 = 8,218.23/x
  3. Step 3: Cross multiply
    8,421.21x = 12,631.85 × 8,218.23
  4. Step 4: Simplify right side
    8,421.21x = 103,811,407.53
  5. Step 5: Solve for x
    x = 103,811,407.53/8,421.21
  6. Step 6: Final answer
    x = 12,327.37

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.