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Finding the Fourth Proportional to 91,369.76, 136,961.28 and 51,843.38

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Solution

The fourth proportional to 91,369.76, 136,961.28 and 51,843.38 is: 77,712.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,369.76 : 136,961.28 = 51,843.38 : x
  2. Step 2: Convert to fraction form
    91,369.76/136,961.28 = 51,843.38/x
  3. Step 3: Cross multiply
    91,369.76x = 136,961.28 × 51,843.38
  4. Step 4: Simplify right side
    91,369.76x = 7,100,534,999.52
  5. Step 5: Solve for x
    x = 7,100,534,999.52/91,369.76
  6. Step 6: Final answer
    x = 77,712.09

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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.