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Finding the Fourth Proportional to 1,274.42, 1,912.05 and 805.35

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Solution

The fourth proportional to 1,274.42, 1,912.05 and 805.35 is: 1,208.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,274.42 : 1,912.05 = 805.35 : x
  2. Step 2: Convert to fraction form
    1,274.42/1,912.05 = 805.35/x
  3. Step 3: Cross multiply
    1,274.42x = 1,912.05 × 805.35
  4. Step 4: Simplify right side
    1,274.42x = 1,539,869.47
  5. Step 5: Solve for x
    x = 1,539,869.47/1,274.42
  6. Step 6: Final answer
    x = 1,208.29

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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.