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Finding the Fourth Proportional to 383.72, 529.38 and 285.48

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Solution

The fourth proportional to 383.72, 529.38 and 285.48 is: 393.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.72 : 529.38 = 285.48 : x
  2. Step 2: Convert to fraction form
    383.72/529.38 = 285.48/x
  3. Step 3: Cross multiply
    383.72x = 529.38 × 285.48
  4. Step 4: Simplify right side
    383.72x = 151,127.40
  5. Step 5: Solve for x
    x = 151,127.40/383.72
  6. Step 6: Final answer
    x = 393.85

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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.