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Finding the Fourth Proportional to 387,391.80, 580,754.86 and 134,639.46

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Solution

The fourth proportional to 387,391.80, 580,754.86 and 134,639.46 is: 201,843.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,391.80 : 580,754.86 = 134,639.46 : x
  2. Step 2: Convert to fraction form
    387,391.80/580,754.86 = 134,639.46/x
  3. Step 3: Cross multiply
    387,391.80x = 580,754.86 × 134,639.46
  4. Step 4: Simplify right side
    387,391.80x = 78,192,520,742.78
  5. Step 5: Solve for x
    x = 78,192,520,742.78/387,391.80
  6. Step 6: Final answer
    x = 201,843.51

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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.