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Finding the Fourth Proportional to 18,712.40, 28,068.60 and 8,344.40

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Solution

The fourth proportional to 18,712.40, 28,068.60 and 8,344.40 is: 12,516.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.40 : 28,068.60 = 8,344.40 : x
  2. Step 2: Convert to fraction form
    18,712.40/28,068.60 = 8,344.40/x
  3. Step 3: Cross multiply
    18,712.40x = 28,068.60 × 8,344.40
  4. Step 4: Simplify right side
    18,712.40x = 234,215,625.84
  5. Step 5: Solve for x
    x = 234,215,625.84/18,712.40
  6. Step 6: Final answer
    x = 12,516.60

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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.