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Finding the Fourth Proportional to 612.60, 845.52 and 391.86

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Solution

The fourth proportional to 612.60, 845.52 and 391.86 is: 540.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.60 : 845.52 = 391.86 : x
  2. Step 2: Convert to fraction form
    612.60/845.52 = 391.86/x
  3. Step 3: Cross multiply
    612.60x = 845.52 × 391.86
  4. Step 4: Simplify right side
    612.60x = 331,325.47
  5. Step 5: Solve for x
    x = 331,325.47/612.60
  6. Step 6: Final answer
    x = 540.85

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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.