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Finding the Fourth Proportional to 905.28, 1,249.20 and 719.22

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Solution

The fourth proportional to 905.28, 1,249.20 and 719.22 is: 992.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.28 : 1,249.20 = 719.22 : x
  2. Step 2: Convert to fraction form
    905.28/1,249.20 = 719.22/x
  3. Step 3: Cross multiply
    905.28x = 1,249.20 × 719.22
  4. Step 4: Simplify right side
    905.28x = 898,449.62
  5. Step 5: Solve for x
    x = 898,449.62/905.28
  6. Step 6: Final answer
    x = 992.45

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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.