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Finding the Fourth Proportional to 380.40, 524.96 and 214.64

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Solution

The fourth proportional to 380.40, 524.96 and 214.64 is: 296.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.40 : 524.96 = 214.64 : x
  2. Step 2: Convert to fraction form
    380.40/524.96 = 214.64/x
  3. Step 3: Cross multiply
    380.40x = 524.96 × 214.64
  4. Step 4: Simplify right side
    380.40x = 112,677.41
  5. Step 5: Solve for x
    x = 112,677.41/380.40
  6. Step 6: Final answer
    x = 296.21

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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.