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Finding the Fourth Proportional to 397,109.76, 548,015.70 and 215,821.71

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Solution

The fourth proportional to 397,109.76, 548,015.70 and 215,821.71 is: 297,836.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    397,109.76 : 548,015.70 = 215,821.71 : x
  2. Step 2: Convert to fraction form
    397,109.76/548,015.70 = 215,821.71/x
  3. Step 3: Cross multiply
    397,109.76x = 548,015.70 × 215,821.71
  4. Step 4: Simplify right side
    397,109.76x = 118,273,685,480.85
  5. Step 5: Solve for x
    x = 118,273,685,480.85/397,109.76
  6. Step 6: Final answer
    x = 297,836.26

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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.