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Finding the Fourth Proportional to 31,239.38, 46,859.03 and 7,865.82

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Solution

The fourth proportional to 31,239.38, 46,859.03 and 7,865.82 is: 11,798.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,239.38 : 46,859.03 = 7,865.82 : x
  2. Step 2: Convert to fraction form
    31,239.38/46,859.03 = 7,865.82/x
  3. Step 3: Cross multiply
    31,239.38x = 46,859.03 × 7,865.82
  4. Step 4: Simplify right side
    31,239.38x = 368,584,656.03
  5. Step 5: Solve for x
    x = 368,584,656.03/31,239.38
  6. Step 6: Final answer
    x = 11,798.72

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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.