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Finding the Fourth Proportional to 379.86, 570.09 and 355.56

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Solution

The fourth proportional to 379.86, 570.09 and 355.56 is: 533.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.86 : 570.09 = 355.56 : x
  2. Step 2: Convert to fraction form
    379.86/570.09 = 355.56/x
  3. Step 3: Cross multiply
    379.86x = 570.09 × 355.56
  4. Step 4: Simplify right side
    379.86x = 202,701.20
  5. Step 5: Solve for x
    x = 202,701.20/379.86
  6. Step 6: Final answer
    x = 533.62

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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.