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Finding the Fourth Proportional to 792.21, 1,090.87 and 718.07

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Solution

The fourth proportional to 792.21, 1,090.87 and 718.07 is: 988.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.21 : 1,090.87 = 718.07 : x
  2. Step 2: Convert to fraction form
    792.21/1,090.87 = 718.07/x
  3. Step 3: Cross multiply
    792.21x = 1,090.87 × 718.07
  4. Step 4: Simplify right side
    792.21x = 783,313.77
  5. Step 5: Solve for x
    x = 783,313.77/792.21
  6. Step 6: Final answer
    x = 988.77

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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.