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Finding the Fourth Proportional to 613.88, 920.21 and 288.66

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Solution

The fourth proportional to 613.88, 920.21 and 288.66 is: 432.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.88 : 920.21 = 288.66 : x
  2. Step 2: Convert to fraction form
    613.88/920.21 = 288.66/x
  3. Step 3: Cross multiply
    613.88x = 920.21 × 288.66
  4. Step 4: Simplify right side
    613.88x = 265,626.38
  5. Step 5: Solve for x
    x = 265,626.38/613.88
  6. Step 6: Final answer
    x = 432.70

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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.