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Finding the Fourth Proportional to 613.50, 920.88 and 325.56

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Solution

The fourth proportional to 613.50, 920.88 and 325.56 is: 488.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.50 : 920.88 = 325.56 : x
  2. Step 2: Convert to fraction form
    613.50/920.88 = 325.56/x
  3. Step 3: Cross multiply
    613.50x = 920.88 × 325.56
  4. Step 4: Simplify right side
    613.50x = 299,801.69
  5. Step 5: Solve for x
    x = 299,801.69/613.50
  6. Step 6: Final answer
    x = 488.67

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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.