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Finding the Fourth Proportional to 699.14, 1,047.26 and 409.88

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Solution

The fourth proportional to 699.14, 1,047.26 and 409.88 is: 613.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    699.14 : 1,047.26 = 409.88 : x
  2. Step 2: Convert to fraction form
    699.14/1,047.26 = 409.88/x
  3. Step 3: Cross multiply
    699.14x = 1,047.26 × 409.88
  4. Step 4: Simplify right side
    699.14x = 429,246.72
  5. Step 5: Solve for x
    x = 429,246.72/699.14
  6. Step 6: Final answer
    x = 613.97

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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.