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Finding the Fourth Proportional to 695.50, 1,042.44 and 387.21

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Solution

The fourth proportional to 695.50, 1,042.44 and 387.21 is: 580.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.50 : 1,042.44 = 387.21 : x
  2. Step 2: Convert to fraction form
    695.50/1,042.44 = 387.21/x
  3. Step 3: Cross multiply
    695.50x = 1,042.44 × 387.21
  4. Step 4: Simplify right side
    695.50x = 403,643.19
  5. Step 5: Solve for x
    x = 403,643.19/695.50
  6. Step 6: Final answer
    x = 580.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.