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Finding the Fourth Proportional to 315,373.80, 472,914.90 and 137,789.40

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Solution

The fourth proportional to 315,373.80, 472,914.90 and 137,789.40 is: 206,620.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,373.80 : 472,914.90 = 137,789.40 : x
  2. Step 2: Convert to fraction form
    315,373.80/472,914.90 = 137,789.40/x
  3. Step 3: Cross multiply
    315,373.80x = 472,914.90 × 137,789.40
  4. Step 4: Simplify right side
    315,373.80x = 65,162,660,322.06
  5. Step 5: Solve for x
    x = 65,162,660,322.06/315,373.80
  6. Step 6: Final answer
    x = 206,620.40

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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.