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Finding the Fourth Proportional to 695.40, 959.78 and 415.65

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Solution

The fourth proportional to 695.40, 959.78 and 415.65 is: 573.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.40 : 959.78 = 415.65 : x
  2. Step 2: Convert to fraction form
    695.40/959.78 = 415.65/x
  3. Step 3: Cross multiply
    695.40x = 959.78 × 415.65
  4. Step 4: Simplify right side
    695.40x = 398,932.56
  5. Step 5: Solve for x
    x = 398,932.56/695.40
  6. Step 6: Final answer
    x = 573.67

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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.