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Finding the Fourth Proportional to 315,404.80, 472,961.40 and 137,820.40

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Solution

The fourth proportional to 315,404.80, 472,961.40 and 137,820.40 is: 206,666.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,404.80 : 472,961.40 = 137,820.40 : x
  2. Step 2: Convert to fraction form
    315,404.80/472,961.40 = 137,820.40/x
  3. Step 3: Cross multiply
    315,404.80x = 472,961.40 × 137,820.40
  4. Step 4: Simplify right side
    315,404.80x = 65,183,729,332.56
  5. Step 5: Solve for x
    x = 65,183,729,332.56/315,404.80
  6. Step 6: Final answer
    x = 206,666.89

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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.