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Finding the Fourth Proportional to 613.71, 920.57 and 289.31

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Solution

The fourth proportional to 613.71, 920.57 and 289.31 is: 433.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.71 : 920.57 = 289.31 : x
  2. Step 2: Convert to fraction form
    613.71/920.57 = 289.31/x
  3. Step 3: Cross multiply
    613.71x = 920.57 × 289.31
  4. Step 4: Simplify right side
    613.71x = 266,324.06
  5. Step 5: Solve for x
    x = 266,324.06/613.71
  6. Step 6: Final answer
    x = 433.96

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Similar ratio
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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.