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Finding the Fourth Proportional to 690.09, 1,034.91 and 279.42

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Solution

The fourth proportional to 690.09, 1,034.91 and 279.42 is: 419.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.09 : 1,034.91 = 279.42 : x
  2. Step 2: Convert to fraction form
    690.09/1,034.91 = 279.42/x
  3. Step 3: Cross multiply
    690.09x = 1,034.91 × 279.42
  4. Step 4: Simplify right side
    690.09x = 289,174.55
  5. Step 5: Solve for x
    x = 289,174.55/690.09
  6. Step 6: Final answer
    x = 419.04

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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.