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Finding the Fourth Proportional to 736.79, 1,104.83 and 428.73

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Solution

The fourth proportional to 736.79, 1,104.83 and 428.73 is: 642.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    736.79 : 1,104.83 = 428.73 : x
  2. Step 2: Convert to fraction form
    736.79/1,104.83 = 428.73/x
  3. Step 3: Cross multiply
    736.79x = 1,104.83 × 428.73
  4. Step 4: Simplify right side
    736.79x = 473,670.29
  5. Step 5: Solve for x
    x = 473,670.29/736.79
  6. Step 6: Final answer
    x = 642.89

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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.