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Finding the Fourth Proportional to 351.48, 526.80 and 221.28

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Solution

The fourth proportional to 351.48, 526.80 and 221.28 is: 331.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.48 : 526.80 = 221.28 : x
  2. Step 2: Convert to fraction form
    351.48/526.80 = 221.28/x
  3. Step 3: Cross multiply
    351.48x = 526.80 × 221.28
  4. Step 4: Simplify right side
    351.48x = 116,570.30
  5. Step 5: Solve for x
    x = 116,570.30/351.48
  6. Step 6: Final answer
    x = 331.66

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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.