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Finding the Fourth Proportional to 499.22, 688.90 and 278.17

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Solution

The fourth proportional to 499.22, 688.90 and 278.17 is: 383.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.22 : 688.90 = 278.17 : x
  2. Step 2: Convert to fraction form
    499.22/688.90 = 278.17/x
  3. Step 3: Cross multiply
    499.22x = 688.90 × 278.17
  4. Step 4: Simplify right side
    499.22x = 191,631.31
  5. Step 5: Solve for x
    x = 191,631.31/499.22
  6. Step 6: Final answer
    x = 383.86

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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.