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Finding the Fourth Proportional to 902.39, 1,353.08 and 285.98

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Solution

The fourth proportional to 902.39, 1,353.08 and 285.98 is: 428.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.39 : 1,353.08 = 285.98 : x
  2. Step 2: Convert to fraction form
    902.39/1,353.08 = 285.98/x
  3. Step 3: Cross multiply
    902.39x = 1,353.08 × 285.98
  4. Step 4: Simplify right side
    902.39x = 386,957.92
  5. Step 5: Solve for x
    x = 386,957.92/902.39
  6. Step 6: Final answer
    x = 428.81

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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.