Home / 1,277.19-1,902.80-1,221.30

Finding the Fourth Proportional to 1,277.19, 1,902.80 and 1,221.30

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Solution

The fourth proportional to 1,277.19, 1,902.80 and 1,221.30 is: 1,819.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,277.19 : 1,902.80 = 1,221.30 : x
  2. Step 2: Convert to fraction form
    1,277.19/1,902.80 = 1,221.30/x
  3. Step 3: Cross multiply
    1,277.19x = 1,902.80 × 1,221.30
  4. Step 4: Simplify right side
    1,277.19x = 2,323,892.69
  5. Step 5: Solve for x
    x = 2,323,892.69/1,277.19
  6. Step 6: Final answer
    x = 1,819.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.