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Finding the Fourth Proportional to 570.31, 855.42 and 159.43

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Solution

The fourth proportional to 570.31, 855.42 and 159.43 is: 239.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.31 : 855.42 = 159.43 : x
  2. Step 2: Convert to fraction form
    570.31/855.42 = 159.43/x
  3. Step 3: Cross multiply
    570.31x = 855.42 × 159.43
  4. Step 4: Simplify right side
    570.31x = 136,379.61
  5. Step 5: Solve for x
    x = 136,379.61/570.31
  6. Step 6: Final answer
    x = 239.13

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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.