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Finding the Fourth Proportional to 499.60, 688.74 and 381.56

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Solution

The fourth proportional to 499.60, 688.74 and 381.56 is: 526.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.60 : 688.74 = 381.56 : x
  2. Step 2: Convert to fraction form
    499.60/688.74 = 381.56/x
  3. Step 3: Cross multiply
    499.60x = 688.74 × 381.56
  4. Step 4: Simplify right side
    499.60x = 262,795.63
  5. Step 5: Solve for x
    x = 262,795.63/499.60
  6. Step 6: Final answer
    x = 526.01

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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.