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Finding the Fourth Proportional to 383.48, 529.12 and 217.68

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Solution

The fourth proportional to 383.48, 529.12 and 217.68 is: 300.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.48 : 529.12 = 217.68 : x
  2. Step 2: Convert to fraction form
    383.48/529.12 = 217.68/x
  3. Step 3: Cross multiply
    383.48x = 529.12 × 217.68
  4. Step 4: Simplify right side
    383.48x = 115,178.84
  5. Step 5: Solve for x
    x = 115,178.84/383.48
  6. Step 6: Final answer
    x = 300.35

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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.