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Finding the Fourth Proportional to 380.81, 525.51 and 215.06

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Solution

The fourth proportional to 380.81, 525.51 and 215.06 is: 296.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.81 : 525.51 = 215.06 : x
  2. Step 2: Convert to fraction form
    380.81/525.51 = 215.06/x
  3. Step 3: Cross multiply
    380.81x = 525.51 × 215.06
  4. Step 4: Simplify right side
    380.81x = 113,016.18
  5. Step 5: Solve for x
    x = 113,016.18/380.81
  6. Step 6: Final answer
    x = 296.78

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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.