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Finding the Fourth Proportional to 570.40, 855.65 and 159.57

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Solution

The fourth proportional to 570.40, 855.65 and 159.57 is: 239.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.40 : 855.65 = 159.57 : x
  2. Step 2: Convert to fraction form
    570.40/855.65 = 159.57/x
  3. Step 3: Cross multiply
    570.40x = 855.65 × 159.57
  4. Step 4: Simplify right side
    570.40x = 136,536.07
  5. Step 5: Solve for x
    x = 136,536.07/570.40
  6. Step 6: Final answer
    x = 239.37

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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.