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Finding the Fourth Proportional to 465.95, 642.96 and 256.11

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Solution

The fourth proportional to 465.95, 642.96 and 256.11 is: 353.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.95 : 642.96 = 256.11 : x
  2. Step 2: Convert to fraction form
    465.95/642.96 = 256.11/x
  3. Step 3: Cross multiply
    465.95x = 642.96 × 256.11
  4. Step 4: Simplify right side
    465.95x = 164,668.49
  5. Step 5: Solve for x
    x = 164,668.49/465.95
  6. Step 6: Final answer
    x = 353.41

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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.