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Finding the Fourth Proportional to 220.31, 328.59 and 207.62

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Solution

The fourth proportional to 220.31, 328.59 and 207.62 is: 309.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    220.31 : 328.59 = 207.62 : x
  2. Step 2: Convert to fraction form
    220.31/328.59 = 207.62/x
  3. Step 3: Cross multiply
    220.31x = 328.59 × 207.62
  4. Step 4: Simplify right side
    220.31x = 68,220.99
  5. Step 5: Solve for x
    x = 68,220.99/220.31
  6. Step 6: Final answer
    x = 309.67

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.