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Finding the Fourth Proportional to 402.61, 555.63 and 245.22

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Solution

The fourth proportional to 402.61, 555.63 and 245.22 is: 338.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.61 : 555.63 = 245.22 : x
  2. Step 2: Convert to fraction form
    402.61/555.63 = 245.22/x
  3. Step 3: Cross multiply
    402.61x = 555.63 × 245.22
  4. Step 4: Simplify right side
    402.61x = 136,250.98
  5. Step 5: Solve for x
    x = 136,250.98/402.61
  6. Step 6: Final answer
    x = 338.42

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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.