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Finding the Fourth Proportional to 500.17, 690.15 and 279.12

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Solution

The fourth proportional to 500.17, 690.15 and 279.12 is: 385.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    500.17 : 690.15 = 279.12 : x
  2. Step 2: Convert to fraction form
    500.17/690.15 = 279.12/x
  3. Step 3: Cross multiply
    500.17x = 690.15 × 279.12
  4. Step 4: Simplify right side
    500.17x = 192,634.67
  5. Step 5: Solve for x
    x = 192,634.67/500.17
  6. Step 6: Final answer
    x = 385.14

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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.