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Finding the Fourth Proportional to 12,438.85, 18,649 and 7,507.39

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Solution

The fourth proportional to 12,438.85, 18,649 and 7,507.39 is: 11,255.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,438.85 : 18,649 = 7,507.39 : x
  2. Step 2: Convert to fraction form
    12,438.85/18,649 = 7,507.39/x
  3. Step 3: Cross multiply
    12,438.85x = 18,649 × 7,507.39
  4. Step 4: Simplify right side
    12,438.85x = 140,005,316.11
  5. Step 5: Solve for x
    x = 140,005,316.11/12,438.85
  6. Step 6: Final answer
    x = 11,255.49

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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.