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Finding the Fourth Proportional to 696.12, 1,042.26 and 438.84

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Solution

The fourth proportional to 696.12, 1,042.26 and 438.84 is: 657.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.12 : 1,042.26 = 438.84 : x
  2. Step 2: Convert to fraction form
    696.12/1,042.26 = 438.84/x
  3. Step 3: Cross multiply
    696.12x = 1,042.26 × 438.84
  4. Step 4: Simplify right side
    696.12x = 457,385.38
  5. Step 5: Solve for x
    x = 457,385.38/696.12
  6. Step 6: Final answer
    x = 657.05

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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.