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Finding the Fourth Proportional to 72,919, 100,628.29 and 39,385

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Solution

The fourth proportional to 72,919, 100,628.29 and 39,385 is: 54,351.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,919 : 100,628.29 = 39,385 : x
  2. Step 2: Convert to fraction form
    72,919/100,628.29 = 39,385/x
  3. Step 3: Cross multiply
    72,919x = 100,628.29 × 39,385
  4. Step 4: Simplify right side
    72,919x = 3,963,245,201.65
  5. Step 5: Solve for x
    x = 3,963,245,201.65/72,919
  6. Step 6: Final answer
    x = 54,351.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.