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Finding the Fourth Proportional to 499.44, 688.72 and 381.72

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Solution

The fourth proportional to 499.44, 688.72 and 381.72 is: 526.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.44 : 688.72 = 381.72 : x
  2. Step 2: Convert to fraction form
    499.44/688.72 = 381.72/x
  3. Step 3: Cross multiply
    499.44x = 688.72 × 381.72
  4. Step 4: Simplify right side
    499.44x = 262,898.20
  5. Step 5: Solve for x
    x = 262,898.20/499.44
  6. Step 6: Final answer
    x = 526.39

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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.