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Finding the Fourth Proportional to 1,290.70, 1,936.34 and 560.39

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Solution

The fourth proportional to 1,290.70, 1,936.34 and 560.39 is: 840.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.70 : 1,936.34 = 560.39 : x
  2. Step 2: Convert to fraction form
    1,290.70/1,936.34 = 560.39/x
  3. Step 3: Cross multiply
    1,290.70x = 1,936.34 × 560.39
  4. Step 4: Simplify right side
    1,290.70x = 1,085,105.57
  5. Step 5: Solve for x
    x = 1,085,105.57/1,290.70
  6. Step 6: Final answer
    x = 840.71

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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.