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Finding the Fourth Proportional to 792.20, 1,090.76 and 719.30

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Solution

The fourth proportional to 792.20, 1,090.76 and 719.30 is: 990.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.20 : 1,090.76 = 719.30 : x
  2. Step 2: Convert to fraction form
    792.20/1,090.76 = 719.30/x
  3. Step 3: Cross multiply
    792.20x = 1,090.76 × 719.30
  4. Step 4: Simplify right side
    792.20x = 784,582.80
  5. Step 5: Solve for x
    x = 784,582.80/792.20
  6. Step 6: Final answer
    x = 990.38

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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.