Home / 1,421.15-2,131.99-434.03

Finding the Fourth Proportional to 1,421.15, 2,131.99 and 434.03

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Solution

The fourth proportional to 1,421.15, 2,131.99 and 434.03 is: 651.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.15 : 2,131.99 = 434.03 : x
  2. Step 2: Convert to fraction form
    1,421.15/2,131.99 = 434.03/x
  3. Step 3: Cross multiply
    1,421.15x = 2,131.99 × 434.03
  4. Step 4: Simplify right side
    1,421.15x = 925,335.87
  5. Step 5: Solve for x
    x = 925,335.87/1,421.15
  6. Step 6: Final answer
    x = 651.12

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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.