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Finding the Fourth Proportional to 764.33, 1,054.79 and 428.25

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Solution

The fourth proportional to 764.33, 1,054.79 and 428.25 is: 591.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.33 : 1,054.79 = 428.25 : x
  2. Step 2: Convert to fraction form
    764.33/1,054.79 = 428.25/x
  3. Step 3: Cross multiply
    764.33x = 1,054.79 × 428.25
  4. Step 4: Simplify right side
    764.33x = 451,718.50
  5. Step 5: Solve for x
    x = 451,718.50/764.33
  6. Step 6: Final answer
    x = 591.00

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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.