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Finding the Fourth Proportional to 462.75, 638.60 and 255.75

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Solution

The fourth proportional to 462.75, 638.60 and 255.75 is: 352.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    462.75 : 638.60 = 255.75 : x
  2. Step 2: Convert to fraction form
    462.75/638.60 = 255.75/x
  3. Step 3: Cross multiply
    462.75x = 638.60 × 255.75
  4. Step 4: Simplify right side
    462.75x = 163,320.67
  5. Step 5: Solve for x
    x = 163,320.67/462.75
  6. Step 6: Final answer
    x = 352.94

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Find fourth proportional to 231.38, 319.30 and 127.88
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Double scale
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1.5x scale

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.