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Finding the Fourth Proportional to 73,915.78, 102,003.87 and 40,381.78

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Solution

The fourth proportional to 73,915.78, 102,003.87 and 40,381.78 is: 55,726.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,915.78 : 102,003.87 = 40,381.78 : x
  2. Step 2: Convert to fraction form
    73,915.78/102,003.87 = 40,381.78/x
  3. Step 3: Cross multiply
    73,915.78x = 102,003.87 × 40,381.78
  4. Step 4: Simplify right side
    73,915.78x = 4,119,097,837.49
  5. Step 5: Solve for x
    x = 4,119,097,837.49/73,915.78
  6. Step 6: Final answer
    x = 55,726.91

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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.