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Finding the Fourth Proportional to 380.90, 525.60 and 215.10

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Solution

The fourth proportional to 380.90, 525.60 and 215.10 is: 296.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.90 : 525.60 = 215.10 : x
  2. Step 2: Convert to fraction form
    380.90/525.60 = 215.10/x
  3. Step 3: Cross multiply
    380.90x = 525.60 × 215.10
  4. Step 4: Simplify right side
    380.90x = 113,056.56
  5. Step 5: Solve for x
    x = 113,056.56/380.90
  6. Step 6: Final answer
    x = 296.81

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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.