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Finding the Fourth Proportional to 18,438.67, 25,438.12 and 11,352.79

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Solution

The fourth proportional to 18,438.67, 25,438.12 and 11,352.79 is: 15,662.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.67 : 25,438.12 = 11,352.79 : x
  2. Step 2: Convert to fraction form
    18,438.67/25,438.12 = 11,352.79/x
  3. Step 3: Cross multiply
    18,438.67x = 25,438.12 × 11,352.79
  4. Step 4: Simplify right side
    18,438.67x = 288,793,637.77
  5. Step 5: Solve for x
    x = 288,793,637.77/18,438.67
  6. Step 6: Final answer
    x = 15,662.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.