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Finding the Fourth Proportional to 500.49, 690.70 and 279.45

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Solution

The fourth proportional to 500.49, 690.70 and 279.45 is: 385.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.49 : 690.70 = 279.45 : x
  2. Step 2: Convert to fraction form
    500.49/690.70 = 279.45/x
  3. Step 3: Cross multiply
    500.49x = 690.70 × 279.45
  4. Step 4: Simplify right side
    500.49x = 193,016.12
  5. Step 5: Solve for x
    x = 193,016.12/500.49
  6. Step 6: Final answer
    x = 385.65

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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.