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Finding the Fourth Proportional to 421,791.76, 635,621.86 and 381,822.88

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Solution

The fourth proportional to 421,791.76, 635,621.86 and 381,822.88 is: 575,390.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    421,791.76 : 635,621.86 = 381,822.88 : x
  2. Step 2: Convert to fraction form
    421,791.76/635,621.86 = 381,822.88/x
  3. Step 3: Cross multiply
    421,791.76x = 635,621.86 × 381,822.88
  4. Step 4: Simplify right side
    421,791.76x = 242,694,969,176.16
  5. Step 5: Solve for x
    x = 242,694,969,176.16/421,791.76
  6. Step 6: Final answer
    x = 575,390.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.