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Finding the Fourth Proportional to 523.72, 722.64 and 399.36

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Solution

The fourth proportional to 523.72, 722.64 and 399.36 is: 551.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.72 : 722.64 = 399.36 : x
  2. Step 2: Convert to fraction form
    523.72/722.64 = 399.36/x
  3. Step 3: Cross multiply
    523.72x = 722.64 × 399.36
  4. Step 4: Simplify right side
    523.72x = 288,593.51
  5. Step 5: Solve for x
    x = 288,593.51/523.72
  6. Step 6: Final answer
    x = 551.05

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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.