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Finding the Fourth Proportional to 696.30, 1,042.38 and 421.56

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Solution

The fourth proportional to 696.30, 1,042.38 and 421.56 is: 631.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.30 : 1,042.38 = 421.56 : x
  2. Step 2: Convert to fraction form
    696.30/1,042.38 = 421.56/x
  3. Step 3: Cross multiply
    696.30x = 1,042.38 × 421.56
  4. Step 4: Simplify right side
    696.30x = 439,425.71
  5. Step 5: Solve for x
    x = 439,425.71/696.30
  6. Step 6: Final answer
    x = 631.09

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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.