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Finding the Fourth Proportional to 402.60, 555.18 and 393.66

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Solution

The fourth proportional to 402.60, 555.18 and 393.66 is: 542.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.60 : 555.18 = 393.66 : x
  2. Step 2: Convert to fraction form
    402.60/555.18 = 393.66/x
  3. Step 3: Cross multiply
    402.60x = 555.18 × 393.66
  4. Step 4: Simplify right side
    402.60x = 218,552.16
  5. Step 5: Solve for x
    x = 218,552.16/402.60
  6. Step 6: Final answer
    x = 542.85

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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.