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Finding the Fourth Proportional to 402.31, 555.20 and 247.06

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Solution

The fourth proportional to 402.31, 555.20 and 247.06 is: 340.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.31 : 555.20 = 247.06 : x
  2. Step 2: Convert to fraction form
    402.31/555.20 = 247.06/x
  3. Step 3: Cross multiply
    402.31x = 555.20 × 247.06
  4. Step 4: Simplify right side
    402.31x = 137,167.71
  5. Step 5: Solve for x
    x = 137,167.71/402.31
  6. Step 6: Final answer
    x = 340.95

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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.