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Finding the Fourth Proportional to 748.32, 1,122.12 and 228.24

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Solution

The fourth proportional to 748.32, 1,122.12 and 228.24 is: 342.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    748.32 : 1,122.12 = 228.24 : x
  2. Step 2: Convert to fraction form
    748.32/1,122.12 = 228.24/x
  3. Step 3: Cross multiply
    748.32x = 1,122.12 × 228.24
  4. Step 4: Simplify right side
    748.32x = 256,112.67
  5. Step 5: Solve for x
    x = 256,112.67/748.32
  6. Step 6: Final answer
    x = 342.25

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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.