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Finding the Fourth Proportional to 612.26, 845.18 and 391.50

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Solution

The fourth proportional to 612.26, 845.18 and 391.50 is: 540.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.26 : 845.18 = 391.50 : x
  2. Step 2: Convert to fraction form
    612.26/845.18 = 391.50/x
  3. Step 3: Cross multiply
    612.26x = 845.18 × 391.50
  4. Step 4: Simplify right side
    612.26x = 330,887.97
  5. Step 5: Solve for x
    x = 330,887.97/612.26
  6. Step 6: Final answer
    x = 540.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.