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Finding the Fourth Proportional to 947.98, 1,308.18 and 555

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Solution

The fourth proportional to 947.98, 1,308.18 and 555 is: 765.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    947.98 : 1,308.18 = 555 : x
  2. Step 2: Convert to fraction form
    947.98/1,308.18 = 555/x
  3. Step 3: Cross multiply
    947.98x = 1,308.18 × 555
  4. Step 4: Simplify right side
    947.98x = 726,039.90
  5. Step 5: Solve for x
    x = 726,039.90/947.98
  6. Step 6: Final answer
    x = 765.88

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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.