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Finding the Fourth Proportional to 741.45, 1,112.31 and 428.79

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Solution

The fourth proportional to 741.45, 1,112.31 and 428.79 is: 643.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.45 : 1,112.31 = 428.79 : x
  2. Step 2: Convert to fraction form
    741.45/1,112.31 = 428.79/x
  3. Step 3: Cross multiply
    741.45x = 1,112.31 × 428.79
  4. Step 4: Simplify right side
    741.45x = 476,947.40
  5. Step 5: Solve for x
    x = 476,947.40/741.45
  6. Step 6: Final answer
    x = 643.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.