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Finding the Fourth Proportional to 99,919.84, 137,729.20 and 67,644.28

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Solution

The fourth proportional to 99,919.84, 137,729.20 and 67,644.28 is: 93,240.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,919.84 : 137,729.20 = 67,644.28 : x
  2. Step 2: Convert to fraction form
    99,919.84/137,729.20 = 67,644.28/x
  3. Step 3: Cross multiply
    99,919.84x = 137,729.20 × 67,644.28
  4. Step 4: Simplify right side
    99,919.84x = 9,316,592,568.98
  5. Step 5: Solve for x
    x = 9,316,592,568.98/99,919.84
  6. Step 6: Final answer
    x = 93,240.67

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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.