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Finding the Fourth Proportional to 465.35, 642.20 and 391.53

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Solution

The fourth proportional to 465.35, 642.20 and 391.53 is: 540.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.35 : 642.20 = 391.53 : x
  2. Step 2: Convert to fraction form
    465.35/642.20 = 391.53/x
  3. Step 3: Cross multiply
    465.35x = 642.20 × 391.53
  4. Step 4: Simplify right side
    465.35x = 251,444.32
  5. Step 5: Solve for x
    x = 251,444.32/465.35
  6. Step 6: Final answer
    x = 540.34

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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.