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Finding the Fourth Proportional to 499.28, 687.73 and 420.51

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Solution

The fourth proportional to 499.28, 687.73 and 420.51 is: 579.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    499.28 : 687.73 = 420.51 : x
  2. Step 2: Convert to fraction form
    499.28/687.73 = 420.51/x
  3. Step 3: Cross multiply
    499.28x = 687.73 × 420.51
  4. Step 4: Simplify right side
    499.28x = 289,195.24
  5. Step 5: Solve for x
    x = 289,195.24/499.28
  6. Step 6: Final answer
    x = 579.22

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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.