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Finding the Fourth Proportional to 612.26, 917.81 and 392.21

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Solution

The fourth proportional to 612.26, 917.81 and 392.21 is: 587.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.26 : 917.81 = 392.21 : x
  2. Step 2: Convert to fraction form
    612.26/917.81 = 392.21/x
  3. Step 3: Cross multiply
    612.26x = 917.81 × 392.21
  4. Step 4: Simplify right side
    612.26x = 359,972.30
  5. Step 5: Solve for x
    x = 359,972.30/612.26
  6. Step 6: Final answer
    x = 587.94

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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.