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Finding the Fourth Proportional to 613.66, 920.76 and 289.26

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Solution

The fourth proportional to 613.66, 920.76 and 289.26 is: 434.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.66 : 920.76 = 289.26 : x
  2. Step 2: Convert to fraction form
    613.66/920.76 = 289.26/x
  3. Step 3: Cross multiply
    613.66x = 920.76 × 289.26
  4. Step 4: Simplify right side
    613.66x = 266,339.04
  5. Step 5: Solve for x
    x = 266,339.04/613.66
  6. Step 6: Final answer
    x = 434.02

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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.