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Finding the Fourth Proportional to 613.22, 918.75 and 324.86

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Solution

The fourth proportional to 613.22, 918.75 and 324.86 is: 486.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.22 : 918.75 = 324.86 : x
  2. Step 2: Convert to fraction form
    613.22/918.75 = 324.86/x
  3. Step 3: Cross multiply
    613.22x = 918.75 × 324.86
  4. Step 4: Simplify right side
    613.22x = 298,465.13
  5. Step 5: Solve for x
    x = 298,465.13/613.22
  6. Step 6: Final answer
    x = 486.72

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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.