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Finding the Fourth Proportional to 18,438.77, 25,438.28 and 11,352.89

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Solution

The fourth proportional to 18,438.77, 25,438.28 and 11,352.89 is: 15,662.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,438.77 : 25,438.28 = 11,352.89 : x
  2. Step 2: Convert to fraction form
    18,438.77/25,438.28 = 11,352.89/x
  3. Step 3: Cross multiply
    18,438.77x = 25,438.28 × 11,352.89
  4. Step 4: Simplify right side
    18,438.77x = 288,797,810.67
  5. Step 5: Solve for x
    x = 288,797,810.67/18,438.77
  6. Step 6: Final answer
    x = 15,662.54

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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.