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Finding the Fourth Proportional to 696.59, 1,047.05 and 438.25

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Solution

The fourth proportional to 696.59, 1,047.05 and 438.25 is: 658.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    696.59 : 1,047.05 = 438.25 : x
  2. Step 2: Convert to fraction form
    696.59/1,047.05 = 438.25/x
  3. Step 3: Cross multiply
    696.59x = 1,047.05 × 438.25
  4. Step 4: Simplify right side
    696.59x = 458,865.45
  5. Step 5: Solve for x
    x = 458,865.45/696.59
  6. Step 6: Final answer
    x = 658.73

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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.