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Finding the Fourth Proportional to 380.17, 570.34 and 120.19

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Solution

The fourth proportional to 380.17, 570.34 and 120.19 is: 180.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.17 : 570.34 = 120.19 : x
  2. Step 2: Convert to fraction form
    380.17/570.34 = 120.19/x
  3. Step 3: Cross multiply
    380.17x = 570.34 × 120.19
  4. Step 4: Simplify right side
    380.17x = 68,547.35
  5. Step 5: Solve for x
    x = 68,547.35/380.17
  6. Step 6: Final answer
    x = 180.31

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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.