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Finding the Fourth Proportional to 281.68, 388.74 and 165.28

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Solution

The fourth proportional to 281.68, 388.74 and 165.28 is: 228.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.68 : 388.74 = 165.28 : x
  2. Step 2: Convert to fraction form
    281.68/388.74 = 165.28/x
  3. Step 3: Cross multiply
    281.68x = 388.74 × 165.28
  4. Step 4: Simplify right side
    281.68x = 64,250.95
  5. Step 5: Solve for x
    x = 64,250.95/281.68
  6. Step 6: Final answer
    x = 228.10

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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.