Home / 1,428.48-1,973.76-1,221.12

Finding the Fourth Proportional to 1,428.48, 1,973.76 and 1,221.12

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Solution

The fourth proportional to 1,428.48, 1,973.76 and 1,221.12 is: 1,687.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,428.48 : 1,973.76 = 1,221.12 : x
  2. Step 2: Convert to fraction form
    1,428.48/1,973.76 = 1,221.12/x
  3. Step 3: Cross multiply
    1,428.48x = 1,973.76 × 1,221.12
  4. Step 4: Simplify right side
    1,428.48x = 2,410,197.81
  5. Step 5: Solve for x
    x = 2,410,197.81/1,428.48
  6. Step 6: Final answer
    x = 1,687.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.