Home / 1,421.01-2,131.52-447.19

Finding the Fourth Proportional to 1,421.01, 2,131.52 and 447.19

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Solution

The fourth proportional to 1,421.01, 2,131.52 and 447.19 is: 670.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.01 : 2,131.52 = 447.19 : x
  2. Step 2: Convert to fraction form
    1,421.01/2,131.52 = 447.19/x
  3. Step 3: Cross multiply
    1,421.01x = 2,131.52 × 447.19
  4. Step 4: Simplify right side
    1,421.01x = 953,186.86
  5. Step 5: Solve for x
    x = 953,186.86/1,421.01
  6. Step 6: Final answer
    x = 670.78

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Double scale
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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.