Home / 1,421.30-2,132.21-447.68

Finding the Fourth Proportional to 1,421.30, 2,132.21 and 447.68

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Solution

The fourth proportional to 1,421.30, 2,132.21 and 447.68 is: 671.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,421.30 : 2,132.21 = 447.68 : x
  2. Step 2: Convert to fraction form
    1,421.30/2,132.21 = 447.68/x
  3. Step 3: Cross multiply
    1,421.30x = 2,132.21 × 447.68
  4. Step 4: Simplify right side
    1,421.30x = 954,538.23
  5. Step 5: Solve for x
    x = 954,538.23/1,421.30
  6. Step 6: Final answer
    x = 671.60

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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.