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Finding the Fourth Proportional to 380.91, 570.90 and 185.75

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Solution

The fourth proportional to 380.91, 570.90 and 185.75 is: 278.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.91 : 570.90 = 185.75 : x
  2. Step 2: Convert to fraction form
    380.91/570.90 = 185.75/x
  3. Step 3: Cross multiply
    380.91x = 570.90 × 185.75
  4. Step 4: Simplify right side
    380.91x = 106,046.10
  5. Step 5: Solve for x
    x = 106,046.10/380.91
  6. Step 6: Final answer
    x = 278.40

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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.