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Finding the Fourth Proportional to 499.56, 689.41 and 278.49

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Solution

The fourth proportional to 499.56, 689.41 and 278.49 is: 384.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.56 : 689.41 = 278.49 : x
  2. Step 2: Convert to fraction form
    499.56/689.41 = 278.49/x
  3. Step 3: Cross multiply
    499.56x = 689.41 × 278.49
  4. Step 4: Simplify right side
    499.56x = 191,993.79
  5. Step 5: Solve for x
    x = 191,993.79/499.56
  6. Step 6: Final answer
    x = 384.33

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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.