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Finding the Fourth Proportional to 500.57, 690.80 and 279.52

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Solution

The fourth proportional to 500.57, 690.80 and 279.52 is: 385.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.57 : 690.80 = 279.52 : x
  2. Step 2: Convert to fraction form
    500.57/690.80 = 279.52/x
  3. Step 3: Cross multiply
    500.57x = 690.80 × 279.52
  4. Step 4: Simplify right side
    500.57x = 193,091.39
  5. Step 5: Solve for x
    x = 193,091.39/500.57
  6. Step 6: Final answer
    x = 385.74

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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.