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Finding the Fourth Proportional to 402.05, 555.33 and 291.35

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Solution

The fourth proportional to 402.05, 555.33 and 291.35 is: 402.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.05 : 555.33 = 291.35 : x
  2. Step 2: Convert to fraction form
    402.05/555.33 = 291.35/x
  3. Step 3: Cross multiply
    402.05x = 555.33 × 291.35
  4. Step 4: Simplify right side
    402.05x = 161,795.40
  5. Step 5: Solve for x
    x = 161,795.40/402.05
  6. Step 6: Final answer
    x = 402.43

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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.