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Finding the Fourth Proportional to 500.43, 690.49 and 279.35

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Solution

The fourth proportional to 500.43, 690.49 and 279.35 is: 385.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.43 : 690.49 = 279.35 : x
  2. Step 2: Convert to fraction form
    500.43/690.49 = 279.35/x
  3. Step 3: Cross multiply
    500.43x = 690.49 × 279.35
  4. Step 4: Simplify right side
    500.43x = 192,887.87
  5. Step 5: Solve for x
    x = 192,887.87/500.43
  6. Step 6: Final answer
    x = 385.45

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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.