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Finding the Fourth Proportional to 380.22, 570.96 and 287.70

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Solution

The fourth proportional to 380.22, 570.96 and 287.70 is: 432.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.22 : 570.96 = 287.70 : x
  2. Step 2: Convert to fraction form
    380.22/570.96 = 287.70/x
  3. Step 3: Cross multiply
    380.22x = 570.96 × 287.70
  4. Step 4: Simplify right side
    380.22x = 164,265.19
  5. Step 5: Solve for x
    x = 164,265.19/380.22
  6. Step 6: Final answer
    x = 432.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.