Home / 1,421.16-2,131.07-447.32

Finding the Fourth Proportional to 1,421.16, 2,131.07 and 447.32

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Solution

The fourth proportional to 1,421.16, 2,131.07 and 447.32 is: 670.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.16 : 2,131.07 = 447.32 : x
  2. Step 2: Convert to fraction form
    1,421.16/2,131.07 = 447.32/x
  3. Step 3: Cross multiply
    1,421.16x = 2,131.07 × 447.32
  4. Step 4: Simplify right side
    1,421.16x = 953,257.34
  5. Step 5: Solve for x
    x = 953,257.34/1,421.16
  6. Step 6: Final answer
    x = 670.76

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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.