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Finding the Fourth Proportional to 465.54, 642.39 and 391.74

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Solution

The fourth proportional to 465.54, 642.39 and 391.74 is: 540.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.54 : 642.39 = 391.74 : x
  2. Step 2: Convert to fraction form
    465.54/642.39 = 391.74/x
  3. Step 3: Cross multiply
    465.54x = 642.39 × 391.74
  4. Step 4: Simplify right side
    465.54x = 251,649.86
  5. Step 5: Solve for x
    x = 251,649.86/465.54
  6. Step 6: Final answer
    x = 540.55

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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.