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Finding the Fourth Proportional to 129,644.80, 194,390.40 and 67,436.80

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Solution

The fourth proportional to 129,644.80, 194,390.40 and 67,436.80 is: 101,115.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,644.80 : 194,390.40 = 67,436.80 : x
  2. Step 2: Convert to fraction form
    129,644.80/194,390.40 = 67,436.80/x
  3. Step 3: Cross multiply
    129,644.80x = 194,390.40 × 67,436.80
  4. Step 4: Simplify right side
    129,644.80x = 13,109,066,526.72
  5. Step 5: Solve for x
    x = 13,109,066,526.72/129,644.80
  6. Step 6: Final answer
    x = 101,115.25

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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.