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Finding the Fourth Proportional to 379.77, 570.09 and 215.24

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Solution

The fourth proportional to 379.77, 570.09 and 215.24 is: 323.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.77 : 570.09 = 215.24 : x
  2. Step 2: Convert to fraction form
    379.77/570.09 = 215.24/x
  3. Step 3: Cross multiply
    379.77x = 570.09 × 215.24
  4. Step 4: Simplify right side
    379.77x = 122,706.12
  5. Step 5: Solve for x
    x = 122,706.12/379.77
  6. Step 6: Final answer
    x = 323.10

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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.