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Finding the Fourth Proportional to 8,540.40, 12,810.60 and 8,212.35

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Solution

The fourth proportional to 8,540.40, 12,810.60 and 8,212.35 is: 12,318.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,540.40 : 12,810.60 = 8,212.35 : x
  2. Step 2: Convert to fraction form
    8,540.40/12,810.60 = 8,212.35/x
  3. Step 3: Cross multiply
    8,540.40x = 12,810.60 × 8,212.35
  4. Step 4: Simplify right side
    8,540.40x = 105,205,130.91
  5. Step 5: Solve for x
    x = 105,205,130.91/8,540.40
  6. Step 6: Final answer
    x = 12,318.53

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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.