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Finding the Fourth Proportional to 667,081.20, 920,196.18 and 421,990.03

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Solution

The fourth proportional to 667,081.20, 920,196.18 and 421,990.03 is: 582,108.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,081.20 : 920,196.18 = 421,990.03 : x
  2. Step 2: Convert to fraction form
    667,081.20/920,196.18 = 421,990.03/x
  3. Step 3: Cross multiply
    667,081.20x = 920,196.18 × 421,990.03
  4. Step 4: Simplify right side
    667,081.20x = 388,313,614,754.33
  5. Step 5: Solve for x
    x = 388,313,614,754.33/667,081.20
  6. Step 6: Final answer
    x = 582,108.46

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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.