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Finding the Fourth Proportional to 1,069.43, 1,604.21 and 780.26

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Solution

The fourth proportional to 1,069.43, 1,604.21 and 780.26 is: 1,170.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,069.43 : 1,604.21 = 780.26 : x
  2. Step 2: Convert to fraction form
    1,069.43/1,604.21 = 780.26/x
  3. Step 3: Cross multiply
    1,069.43x = 1,604.21 × 780.26
  4. Step 4: Simplify right side
    1,069.43x = 1,251,688.97
  5. Step 5: Solve for x
    x = 1,251,688.97/1,069.43
  6. Step 6: Final answer
    x = 1,170.43

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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.