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Finding the Fourth Proportional to 100,704.40, 138,975.64 and 55,385.89

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Solution

The fourth proportional to 100,704.40, 138,975.64 and 55,385.89 is: 76,434.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,704.40 : 138,975.64 = 55,385.89 : x
  2. Step 2: Convert to fraction form
    100,704.40/138,975.64 = 55,385.89/x
  3. Step 3: Cross multiply
    100,704.40x = 138,975.64 × 55,385.89
  4. Step 4: Simplify right side
    100,704.40x = 7,697,289,509.72
  5. Step 5: Solve for x
    x = 7,697,289,509.72/100,704.40
  6. Step 6: Final answer
    x = 76,434.49

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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.