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Finding the Fourth Proportional to 500.29, 690.40 and 279.26

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Solution

The fourth proportional to 500.29, 690.40 and 279.26 is: 385.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.29 : 690.40 = 279.26 : x
  2. Step 2: Convert to fraction form
    500.29/690.40 = 279.26/x
  3. Step 3: Cross multiply
    500.29x = 690.40 × 279.26
  4. Step 4: Simplify right side
    500.29x = 192,797.65
  5. Step 5: Solve for x
    x = 192,797.65/500.29
  6. Step 6: Final answer
    x = 385.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.