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Finding the Fourth Proportional to 402.28, 555.16 and 247.03

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Solution

The fourth proportional to 402.28, 555.16 and 247.03 is: 340.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.28 : 555.16 = 247.03 : x
  2. Step 2: Convert to fraction form
    402.28/555.16 = 247.03/x
  3. Step 3: Cross multiply
    402.28x = 555.16 × 247.03
  4. Step 4: Simplify right side
    402.28x = 137,141.17
  5. Step 5: Solve for x
    x = 137,141.17/402.28
  6. Step 6: Final answer
    x = 340.91

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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.