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Finding the Fourth Proportional to 402.55, 555.40 and 245.24

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Solution

The fourth proportional to 402.55, 555.40 and 245.24 is: 338.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.55 : 555.40 = 245.24 : x
  2. Step 2: Convert to fraction form
    402.55/555.40 = 245.24/x
  3. Step 3: Cross multiply
    402.55x = 555.40 × 245.24
  4. Step 4: Simplify right side
    402.55x = 136,206.30
  5. Step 5: Solve for x
    x = 136,206.30/402.55
  6. Step 6: Final answer
    x = 338.36

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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.