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Finding the Fourth Proportional to 1,274.53, 1,911.98 and 581.20

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Solution

The fourth proportional to 1,274.53, 1,911.98 and 581.20 is: 871.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.53 : 1,911.98 = 581.20 : x
  2. Step 2: Convert to fraction form
    1,274.53/1,911.98 = 581.20/x
  3. Step 3: Cross multiply
    1,274.53x = 1,911.98 × 581.20
  4. Step 4: Simplify right side
    1,274.53x = 1,111,242.78
  5. Step 5: Solve for x
    x = 1,111,242.78/1,274.53
  6. Step 6: Final answer
    x = 871.88

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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.