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Finding the Fourth Proportional to 523.42, 784.22 and 386.80

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Solution

The fourth proportional to 523.42, 784.22 and 386.80 is: 579.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.42 : 784.22 = 386.80 : x
  2. Step 2: Convert to fraction form
    523.42/784.22 = 386.80/x
  3. Step 3: Cross multiply
    523.42x = 784.22 × 386.80
  4. Step 4: Simplify right side
    523.42x = 303,336.30
  5. Step 5: Solve for x
    x = 303,336.30/523.42
  6. Step 6: Final answer
    x = 579.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.