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Finding the Fourth Proportional to 695.48, 1,042.67 and 421.49

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Solution

The fourth proportional to 695.48, 1,042.67 and 421.49 is: 631.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.48 : 1,042.67 = 421.49 : x
  2. Step 2: Convert to fraction form
    695.48/1,042.67 = 421.49/x
  3. Step 3: Cross multiply
    695.48x = 1,042.67 × 421.49
  4. Step 4: Simplify right side
    695.48x = 439,467.66
  5. Step 5: Solve for x
    x = 439,467.66/695.48
  6. Step 6: Final answer
    x = 631.90

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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.