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Finding the Fourth Proportional to 1,570.22, 2,166.92 and 871.59

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Solution

The fourth proportional to 1,570.22, 2,166.92 and 871.59 is: 1,202.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,570.22 : 2,166.92 = 871.59 : x
  2. Step 2: Convert to fraction form
    1,570.22/2,166.92 = 871.59/x
  3. Step 3: Cross multiply
    1,570.22x = 2,166.92 × 871.59
  4. Step 4: Simplify right side
    1,570.22x = 1,888,672.84
  5. Step 5: Solve for x
    x = 1,888,672.84/1,570.22
  6. Step 6: Final answer
    x = 1,202.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.