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Finding the Fourth Proportional to 690.85, 1,035.47 and 279.44

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Solution

The fourth proportional to 690.85, 1,035.47 and 279.44 is: 418.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.85 : 1,035.47 = 279.44 : x
  2. Step 2: Convert to fraction form
    690.85/1,035.47 = 279.44/x
  3. Step 3: Cross multiply
    690.85x = 1,035.47 × 279.44
  4. Step 4: Simplify right side
    690.85x = 289,351.74
  5. Step 5: Solve for x
    x = 289,351.74/690.85
  6. Step 6: Final answer
    x = 418.83

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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.