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Finding the Fourth Proportional to 1,274.22, 1,911.42 and 580.91

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Solution

The fourth proportional to 1,274.22, 1,911.42 and 580.91 is: 871.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.22 : 1,911.42 = 580.91 : x
  2. Step 2: Convert to fraction form
    1,274.22/1,911.42 = 580.91/x
  3. Step 3: Cross multiply
    1,274.22x = 1,911.42 × 580.91
  4. Step 4: Simplify right side
    1,274.22x = 1,110,353.44
  5. Step 5: Solve for x
    x = 1,110,353.44/1,274.22
  6. Step 6: Final answer
    x = 871.40

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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.