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Finding the Fourth Proportional to 612.21, 917.67 and 265.38

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Solution

The fourth proportional to 612.21, 917.67 and 265.38 is: 397.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.21 : 917.67 = 265.38 : x
  2. Step 2: Convert to fraction form
    612.21/917.67 = 265.38/x
  3. Step 3: Cross multiply
    612.21x = 917.67 × 265.38
  4. Step 4: Simplify right side
    612.21x = 243,531.26
  5. Step 5: Solve for x
    x = 243,531.26/612.21
  6. Step 6: Final answer
    x = 397.79

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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.