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Finding the Fourth Proportional to 381,297.80, 525,712.20 and 279,145.91

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Solution

The fourth proportional to 381,297.80, 525,712.20 and 279,145.91 is: 384,870.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,297.80 : 525,712.20 = 279,145.91 : x
  2. Step 2: Convert to fraction form
    381,297.80/525,712.20 = 279,145.91/x
  3. Step 3: Cross multiply
    381,297.80x = 525,712.20 × 279,145.91
  4. Step 4: Simplify right side
    381,297.80x = 146,750,410,467.10
  5. Step 5: Solve for x
    x = 146,750,410,467.10/381,297.80
  6. Step 6: Final answer
    x = 384,870.86

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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.