Home / 1,421.23-2,129.87-1,074.28

Finding the Fourth Proportional to 1,421.23, 2,129.87 and 1,074.28

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Solution

The fourth proportional to 1,421.23, 2,129.87 and 1,074.28 is: 1,609.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.23 : 2,129.87 = 1,074.28 : x
  2. Step 2: Convert to fraction form
    1,421.23/2,129.87 = 1,074.28/x
  3. Step 3: Cross multiply
    1,421.23x = 2,129.87 × 1,074.28
  4. Step 4: Simplify right side
    1,421.23x = 2,288,076.74
  5. Step 5: Solve for x
    x = 2,288,076.74/1,421.23
  6. Step 6: Final answer
    x = 1,609.93

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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.