Home / 1,421.18-2,131.86-447.32

Finding the Fourth Proportional to 1,421.18, 2,131.86 and 447.32

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Solution

The fourth proportional to 1,421.18, 2,131.86 and 447.32 is: 671.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.18 : 2,131.86 = 447.32 : x
  2. Step 2: Convert to fraction form
    1,421.18/2,131.86 = 447.32/x
  3. Step 3: Cross multiply
    1,421.18x = 2,131.86 × 447.32
  4. Step 4: Simplify right side
    1,421.18x = 953,623.62
  5. Step 5: Solve for x
    x = 953,623.62/1,421.18
  6. Step 6: Final answer
    x = 671.01

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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.