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Finding the Fourth Proportional to 499.33, 689.11 and 278.32

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Solution

The fourth proportional to 499.33, 689.11 and 278.32 is: 384.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.33 : 689.11 = 278.32 : x
  2. Step 2: Convert to fraction form
    499.33/689.11 = 278.32/x
  3. Step 3: Cross multiply
    499.33x = 689.11 × 278.32
  4. Step 4: Simplify right side
    499.33x = 191,790.68
  5. Step 5: Solve for x
    x = 191,790.68/499.33
  6. Step 6: Final answer
    x = 384.10

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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.