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Finding the Fourth Proportional to 465.71, 642.68 and 255.90

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Solution

The fourth proportional to 465.71, 642.68 and 255.90 is: 353.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.71 : 642.68 = 255.90 : x
  2. Step 2: Convert to fraction form
    465.71/642.68 = 255.90/x
  3. Step 3: Cross multiply
    465.71x = 642.68 × 255.90
  4. Step 4: Simplify right side
    465.71x = 164,460.53
  5. Step 5: Solve for x
    x = 164,460.53/465.71
  6. Step 6: Final answer
    x = 353.14

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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.