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Finding the Fourth Proportional to 380.53, 525.12 and 214.78

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Solution

The fourth proportional to 380.53, 525.12 and 214.78 is: 296.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.53 : 525.12 = 214.78 : x
  2. Step 2: Convert to fraction form
    380.53/525.12 = 214.78/x
  3. Step 3: Cross multiply
    380.53x = 525.12 × 214.78
  4. Step 4: Simplify right side
    380.53x = 112,785.27
  5. Step 5: Solve for x
    x = 112,785.27/380.53
  6. Step 6: Final answer
    x = 296.39

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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.