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Finding the Fourth Proportional to 764.27, 1,054.66 and 428.19

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Solution

The fourth proportional to 764.27, 1,054.66 and 428.19 is: 590.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.27 : 1,054.66 = 428.19 : x
  2. Step 2: Convert to fraction form
    764.27/1,054.66 = 428.19/x
  3. Step 3: Cross multiply
    764.27x = 1,054.66 × 428.19
  4. Step 4: Simplify right side
    764.27x = 451,594.87
  5. Step 5: Solve for x
    x = 451,594.87/764.27
  6. Step 6: Final answer
    x = 590.88

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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.