Home / 12,643.20-17,438.40-8,449.92

Finding the Fourth Proportional to 12,643.20, 17,438.40 and 8,449.92

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Solution

The fourth proportional to 12,643.20, 17,438.40 and 8,449.92 is: 11,654.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,643.20 : 17,438.40 = 8,449.92 : x
  2. Step 2: Convert to fraction form
    12,643.20/17,438.40 = 8,449.92/x
  3. Step 3: Cross multiply
    12,643.20x = 17,438.40 × 8,449.92
  4. Step 4: Simplify right side
    12,643.20x = 147,353,084.93
  5. Step 5: Solve for x
    x = 147,353,084.93/12,643.20
  6. Step 6: Final answer
    x = 11,654.73

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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.