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Finding the Fourth Proportional to 137,555.21, 206,392.25 and 74,419.76

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Solution

The fourth proportional to 137,555.21, 206,392.25 and 74,419.76 is: 111,661.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,555.21 : 206,392.25 = 74,419.76 : x
  2. Step 2: Convert to fraction form
    137,555.21/206,392.25 = 74,419.76/x
  3. Step 3: Cross multiply
    137,555.21x = 206,392.25 × 74,419.76
  4. Step 4: Simplify right side
    137,555.21x = 15,359,662,412.89
  5. Step 5: Solve for x
    x = 15,359,662,412.89/137,555.21
  6. Step 6: Final answer
    x = 111,661.80

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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.