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Finding the Fourth Proportional to 380.65, 570.95 and 120.64

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Solution

The fourth proportional to 380.65, 570.95 and 120.64 is: 180.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.65 : 570.95 = 120.64 : x
  2. Step 2: Convert to fraction form
    380.65/570.95 = 120.64/x
  3. Step 3: Cross multiply
    380.65x = 570.95 × 120.64
  4. Step 4: Simplify right side
    380.65x = 68,878.90
  5. Step 5: Solve for x
    x = 68,878.90/380.65
  6. Step 6: Final answer
    x = 180.95

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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.