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Finding the Fourth Proportional to 695.34, 1,042.48 and 421.36

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Solution

The fourth proportional to 695.34, 1,042.48 and 421.36 is: 631.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    695.34 : 1,042.48 = 421.36 : x
  2. Step 2: Convert to fraction form
    695.34/1,042.48 = 421.36/x
  3. Step 3: Cross multiply
    695.34x = 1,042.48 × 421.36
  4. Step 4: Simplify right side
    695.34x = 439,259.37
  5. Step 5: Solve for x
    x = 439,259.37/695.34
  6. Step 6: Final answer
    x = 631.72

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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.