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Finding the Fourth Proportional to 383.20, 528.80 and 215.16

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Solution

The fourth proportional to 383.20, 528.80 and 215.16 is: 296.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    383.20 : 528.80 = 215.16 : x
  2. Step 2: Convert to fraction form
    383.20/528.80 = 215.16/x
  3. Step 3: Cross multiply
    383.20x = 528.80 × 215.16
  4. Step 4: Simplify right side
    383.20x = 113,773.55
  5. Step 5: Solve for x
    x = 113,773.55/383.20
  6. Step 6: Final answer
    x = 296.91

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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.