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Finding the Fourth Proportional to 612.52, 845.52 and 391.66

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Solution

The fourth proportional to 612.52, 845.52 and 391.66 is: 540.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.52 : 845.52 = 391.66 : x
  2. Step 2: Convert to fraction form
    612.52/845.52 = 391.66/x
  3. Step 3: Cross multiply
    612.52x = 845.52 × 391.66
  4. Step 4: Simplify right side
    612.52x = 331,156.36
  5. Step 5: Solve for x
    x = 331,156.36/612.52
  6. Step 6: Final answer
    x = 540.65

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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.