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Finding the Fourth Proportional to 31,865.38, 47,797.90 and 8,172.82

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Solution

The fourth proportional to 31,865.38, 47,797.90 and 8,172.82 is: 12,259.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,865.38 : 47,797.90 = 8,172.82 : x
  2. Step 2: Convert to fraction form
    31,865.38/47,797.90 = 8,172.82/x
  3. Step 3: Cross multiply
    31,865.38x = 47,797.90 × 8,172.82
  4. Step 4: Simplify right side
    31,865.38x = 390,643,633.08
  5. Step 5: Solve for x
    x = 390,643,633.08/31,865.38
  6. Step 6: Final answer
    x = 12,259.19

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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.