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Finding the Fourth Proportional to 902.32, 1,245.36 and 861.28

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Solution

The fourth proportional to 902.32, 1,245.36 and 861.28 is: 1,188.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    902.32 : 1,245.36 = 861.28 : x
  2. Step 2: Convert to fraction form
    902.32/1,245.36 = 861.28/x
  3. Step 3: Cross multiply
    902.32x = 1,245.36 × 861.28
  4. Step 4: Simplify right side
    902.32x = 1,072,603.66
  5. Step 5: Solve for x
    x = 1,072,603.66/902.32
  6. Step 6: Final answer
    x = 1,188.72

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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.