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Finding the Fourth Proportional to 402.69, 555.49 and 255.07

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Solution

The fourth proportional to 402.69, 555.49 and 255.07 is: 351.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.69 : 555.49 = 255.07 : x
  2. Step 2: Convert to fraction form
    402.69/555.49 = 255.07/x
  3. Step 3: Cross multiply
    402.69x = 555.49 × 255.07
  4. Step 4: Simplify right side
    402.69x = 141,688.83
  5. Step 5: Solve for x
    x = 141,688.83/402.69
  6. Step 6: Final answer
    x = 351.86

Related Problems

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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.