Home / 1,421.04-2,128.44-871.56

Finding the Fourth Proportional to 1,421.04, 2,128.44 and 871.56

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Solution

The fourth proportional to 1,421.04, 2,128.44 and 871.56 is: 1,305.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.04 : 2,128.44 = 871.56 : x
  2. Step 2: Convert to fraction form
    1,421.04/2,128.44 = 871.56/x
  3. Step 3: Cross multiply
    1,421.04x = 2,128.44 × 871.56
  4. Step 4: Simplify right side
    1,421.04x = 1,855,063.17
  5. Step 5: Solve for x
    x = 1,855,063.17/1,421.04
  6. Step 6: Final answer
    x = 1,305.43

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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.