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Finding the Fourth Proportional to 12,642.39, 18,957.15 and 7,099.56

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Solution

The fourth proportional to 12,642.39, 18,957.15 and 7,099.56 is: 10,645.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,642.39 : 18,957.15 = 7,099.56 : x
  2. Step 2: Convert to fraction form
    12,642.39/18,957.15 = 7,099.56/x
  3. Step 3: Cross multiply
    12,642.39x = 18,957.15 × 7,099.56
  4. Step 4: Simplify right side
    12,642.39x = 134,587,423.85
  5. Step 5: Solve for x
    x = 134,587,423.85/12,642.39
  6. Step 6: Final answer
    x = 10,645.73

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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.