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Finding the Fourth Proportional to 402.45, 555.38 and 247.20

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Solution

The fourth proportional to 402.45, 555.38 and 247.20 is: 341.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.45 : 555.38 = 247.20 : x
  2. Step 2: Convert to fraction form
    402.45/555.38 = 247.20/x
  3. Step 3: Cross multiply
    402.45x = 555.38 × 247.20
  4. Step 4: Simplify right side
    402.45x = 137,289.94
  5. Step 5: Solve for x
    x = 137,289.94/402.45
  6. Step 6: Final answer
    x = 341.14

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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.