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Finding the Fourth Proportional to 486,396.80, 671,238.90 and 305,116.37

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Solution

The fourth proportional to 486,396.80, 671,238.90 and 305,116.37 is: 421,067.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    486,396.80 : 671,238.90 = 305,116.37 : x
  2. Step 2: Convert to fraction form
    486,396.80/671,238.90 = 305,116.37/x
  3. Step 3: Cross multiply
    486,396.80x = 671,238.90 × 305,116.37
  4. Step 4: Simplify right side
    486,396.80x = 204,805,975,731.74
  5. Step 5: Solve for x
    x = 204,805,975,731.74/486,396.80
  6. Step 6: Final answer
    x = 421,067.69

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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.