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Finding the Fourth Proportional to 100,376.11, 138,520.80 and 55,053.67

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Solution

The fourth proportional to 100,376.11, 138,520.80 and 55,053.67 is: 75,975.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,376.11 : 138,520.80 = 55,053.67 : x
  2. Step 2: Convert to fraction form
    100,376.11/138,520.80 = 55,053.67/x
  3. Step 3: Cross multiply
    100,376.11x = 138,520.80 × 55,053.67
  4. Step 4: Simplify right side
    100,376.11x = 7,626,078,411.34
  5. Step 5: Solve for x
    x = 7,626,078,411.34/100,376.11
  6. Step 6: Final answer
    x = 75,975.03

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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.