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Finding the Fourth Proportional to 695.31, 959.55 and 415.55

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Solution

The fourth proportional to 695.31, 959.55 and 415.55 is: 573.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.31 : 959.55 = 415.55 : x
  2. Step 2: Convert to fraction form
    695.31/959.55 = 415.55/x
  3. Step 3: Cross multiply
    695.31x = 959.55 × 415.55
  4. Step 4: Simplify right side
    695.31x = 398,743.40
  5. Step 5: Solve for x
    x = 398,743.40/695.31
  6. Step 6: Final answer
    x = 573.48

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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.