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Finding the Fourth Proportional to 1,311.01, 1,809.17 and 713.51

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Solution

The fourth proportional to 1,311.01, 1,809.17 and 713.51 is: 984.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.01 : 1,809.17 = 713.51 : x
  2. Step 2: Convert to fraction form
    1,311.01/1,809.17 = 713.51/x
  3. Step 3: Cross multiply
    1,311.01x = 1,809.17 × 713.51
  4. Step 4: Simplify right side
    1,311.01x = 1,290,860.89
  5. Step 5: Solve for x
    x = 1,290,860.89/1,311.01
  6. Step 6: Final answer
    x = 984.63

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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.