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Finding the Fourth Proportional to 402.75, 555.75 and 255.42

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Solution

The fourth proportional to 402.75, 555.75 and 255.42 is: 352.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.75 : 555.75 = 255.42 : x
  2. Step 2: Convert to fraction form
    402.75/555.75 = 255.42/x
  3. Step 3: Cross multiply
    402.75x = 555.75 × 255.42
  4. Step 4: Simplify right side
    402.75x = 141,949.67
  5. Step 5: Solve for x
    x = 141,949.67/402.75
  6. Step 6: Final answer
    x = 352.45

Related Problems

Find fourth proportional to 201.38, 277.88 and 127.71
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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.