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Finding the Fourth Proportional to 1,253.76, 1,890.56 and 1,221.76

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Solution

The fourth proportional to 1,253.76, 1,890.56 and 1,221.76 is: 1,842.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.76 : 1,890.56 = 1,221.76 : x
  2. Step 2: Convert to fraction form
    1,253.76/1,890.56 = 1,221.76/x
  3. Step 3: Cross multiply
    1,253.76x = 1,890.56 × 1,221.76
  4. Step 4: Simplify right side
    1,253.76x = 2,309,810.59
  5. Step 5: Solve for x
    x = 2,309,810.59/1,253.76
  6. Step 6: Final answer
    x = 1,842.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.