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Finding the Fourth Proportional to 613.76, 920.77 and 289.49

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Solution

The fourth proportional to 613.76, 920.77 and 289.49 is: 434.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.76 : 920.77 = 289.49 : x
  2. Step 2: Convert to fraction form
    613.76/920.77 = 289.49/x
  3. Step 3: Cross multiply
    613.76x = 920.77 × 289.49
  4. Step 4: Simplify right side
    613.76x = 266,548.38
  5. Step 5: Solve for x
    x = 266,548.38/613.76
  6. Step 6: Final answer
    x = 434.29

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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.