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Finding the Fourth Proportional to 351.40, 526.56 and 221.26

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Solution

The fourth proportional to 351.40, 526.56 and 221.26 is: 331.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    351.40 : 526.56 = 221.26 : x
  2. Step 2: Convert to fraction form
    351.40/526.56 = 221.26/x
  3. Step 3: Cross multiply
    351.40x = 526.56 × 221.26
  4. Step 4: Simplify right side
    351.40x = 116,506.67
  5. Step 5: Solve for x
    x = 116,506.67/351.40
  6. Step 6: Final answer
    x = 331.55

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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.