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Finding the Fourth Proportional to 465.55, 642.45 and 255.74

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Solution

The fourth proportional to 465.55, 642.45 and 255.74 is: 352.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    465.55 : 642.45 = 255.74 : x
  2. Step 2: Convert to fraction form
    465.55/642.45 = 255.74/x
  3. Step 3: Cross multiply
    465.55x = 642.45 × 255.74
  4. Step 4: Simplify right side
    465.55x = 164,297.91
  5. Step 5: Solve for x
    x = 164,297.91/465.55
  6. Step 6: Final answer
    x = 352.91

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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.