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Finding the Fourth Proportional to 1,224.76, 1,690.16 and 727.56

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Solution

The fourth proportional to 1,224.76, 1,690.16 and 727.56 is: 1,004.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.76 : 1,690.16 = 727.56 : x
  2. Step 2: Convert to fraction form
    1,224.76/1,690.16 = 727.56/x
  3. Step 3: Cross multiply
    1,224.76x = 1,690.16 × 727.56
  4. Step 4: Simplify right side
    1,224.76x = 1,229,692.81
  5. Step 5: Solve for x
    x = 1,229,692.81/1,224.76
  6. Step 6: Final answer
    x = 1,004.03

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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.