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Finding the Fourth Proportional to 902.40, 1,353.72 and 878.64

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Solution

The fourth proportional to 902.40, 1,353.72 and 878.64 is: 1,318.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.40 : 1,353.72 = 878.64 : x
  2. Step 2: Convert to fraction form
    902.40/1,353.72 = 878.64/x
  3. Step 3: Cross multiply
    902.40x = 1,353.72 × 878.64
  4. Step 4: Simplify right side
    902.40x = 1,189,432.54
  5. Step 5: Solve for x
    x = 1,189,432.54/902.40
  6. Step 6: Final answer
    x = 1,318.08

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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.