Home / 1,421.58-2,131.82-434.09

Finding the Fourth Proportional to 1,421.58, 2,131.82 and 434.09

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Solution

The fourth proportional to 1,421.58, 2,131.82 and 434.09 is: 650.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.58 : 2,131.82 = 434.09 : x
  2. Step 2: Convert to fraction form
    1,421.58/2,131.82 = 434.09/x
  3. Step 3: Cross multiply
    1,421.58x = 2,131.82 × 434.09
  4. Step 4: Simplify right side
    1,421.58x = 925,406.53
  5. Step 5: Solve for x
    x = 925,406.53/1,421.58
  6. Step 6: Final answer
    x = 650.97

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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.