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Finding the Fourth Proportional to 1,294.28, 1,784.76 and 1,219.88

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Solution

The fourth proportional to 1,294.28, 1,784.76 and 1,219.88 is: 1,682.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,294.28 : 1,784.76 = 1,219.88 : x
  2. Step 2: Convert to fraction form
    1,294.28/1,784.76 = 1,219.88/x
  3. Step 3: Cross multiply
    1,294.28x = 1,784.76 × 1,219.88
  4. Step 4: Simplify right side
    1,294.28x = 2,177,193.03
  5. Step 5: Solve for x
    x = 2,177,193.03/1,294.28
  6. Step 6: Final answer
    x = 1,682.17

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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.