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Finding the Fourth Proportional to 39,891.56, 59,835.18 and 12,189.56

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Solution

The fourth proportional to 39,891.56, 59,835.18 and 12,189.56 is: 18,283.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,891.56 : 59,835.18 = 12,189.56 : x
  2. Step 2: Convert to fraction form
    39,891.56/59,835.18 = 12,189.56/x
  3. Step 3: Cross multiply
    39,891.56x = 59,835.18 × 12,189.56
  4. Step 4: Simplify right side
    39,891.56x = 729,364,516.72
  5. Step 5: Solve for x
    x = 729,364,516.72/39,891.56
  6. Step 6: Final answer
    x = 18,283.68

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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.