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Finding the Fourth Proportional to 570.21, 855.31 and 353.13

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Solution

The fourth proportional to 570.21, 855.31 and 353.13 is: 529.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.21 : 855.31 = 353.13 : x
  2. Step 2: Convert to fraction form
    570.21/855.31 = 353.13/x
  3. Step 3: Cross multiply
    570.21x = 855.31 × 353.13
  4. Step 4: Simplify right side
    570.21x = 302,035.62
  5. Step 5: Solve for x
    x = 302,035.62/570.21
  6. Step 6: Final answer
    x = 529.69

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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.