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Finding the Fourth Proportional to 1,311.26, 1,809.53 and 744.20

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Solution

The fourth proportional to 1,311.26, 1,809.53 and 744.20 is: 1,026.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.26 : 1,809.53 = 744.20 : x
  2. Step 2: Convert to fraction form
    1,311.26/1,809.53 = 744.20/x
  3. Step 3: Cross multiply
    1,311.26x = 1,809.53 × 744.20
  4. Step 4: Simplify right side
    1,311.26x = 1,346,652.23
  5. Step 5: Solve for x
    x = 1,346,652.23/1,311.26
  6. Step 6: Final answer
    x = 1,026.99

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.