Home / 1,421.19-2,128.94-1,129.18

Finding the Fourth Proportional to 1,421.19, 2,128.94 and 1,129.18

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Solution

The fourth proportional to 1,421.19, 2,128.94 and 1,129.18 is: 1,691.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.19 : 2,128.94 = 1,129.18 : x
  2. Step 2: Convert to fraction form
    1,421.19/2,128.94 = 1,129.18/x
  3. Step 3: Cross multiply
    1,421.19x = 2,128.94 × 1,129.18
  4. Step 4: Simplify right side
    1,421.19x = 2,403,950.82
  5. Step 5: Solve for x
    x = 2,403,950.82/1,421.19
  6. Step 6: Final answer
    x = 1,691.51

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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.