Home / 1,428.84-2,140.71-1,221.30

Finding the Fourth Proportional to 1,428.84, 2,140.71 and 1,221.30

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Solution

The fourth proportional to 1,428.84, 2,140.71 and 1,221.30 is: 1,829.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.84 : 2,140.71 = 1,221.30 : x
  2. Step 2: Convert to fraction form
    1,428.84/2,140.71 = 1,221.30/x
  3. Step 3: Cross multiply
    1,428.84x = 2,140.71 × 1,221.30
  4. Step 4: Simplify right side
    1,428.84x = 2,614,449.12
  5. Step 5: Solve for x
    x = 2,614,449.12/1,428.84
  6. Step 6: Final answer
    x = 1,829.77

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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.