Home / 1,421.36-2,131.93-447.45

Finding the Fourth Proportional to 1,421.36, 2,131.93 and 447.45

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Solution

The fourth proportional to 1,421.36, 2,131.93 and 447.45 is: 671.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.36 : 2,131.93 = 447.45 : x
  2. Step 2: Convert to fraction form
    1,421.36/2,131.93 = 447.45/x
  3. Step 3: Cross multiply
    1,421.36x = 2,131.93 × 447.45
  4. Step 4: Simplify right side
    1,421.36x = 953,932.08
  5. Step 5: Solve for x
    x = 953,932.08/1,421.36
  6. Step 6: Final answer
    x = 671.14

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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.