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Finding the Fourth Proportional to 380.39, 570.58 and 172.28

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Solution

The fourth proportional to 380.39, 570.58 and 172.28 is: 258.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.39 : 570.58 = 172.28 : x
  2. Step 2: Convert to fraction form
    380.39/570.58 = 172.28/x
  3. Step 3: Cross multiply
    380.39x = 570.58 × 172.28
  4. Step 4: Simplify right side
    380.39x = 98,300.52
  5. Step 5: Solve for x
    x = 98,300.52/380.39
  6. Step 6: Final answer
    x = 258.42

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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.