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Finding the Fourth Proportional to 804.40, 1,109.40 and 711.22

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Solution

The fourth proportional to 804.40, 1,109.40 and 711.22 is: 980.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    804.40 : 1,109.40 = 711.22 : x
  2. Step 2: Convert to fraction form
    804.40/1,109.40 = 711.22/x
  3. Step 3: Cross multiply
    804.40x = 1,109.40 × 711.22
  4. Step 4: Simplify right side
    804.40x = 789,027.47
  5. Step 5: Solve for x
    x = 789,027.47/804.40
  6. Step 6: Final answer
    x = 980.89

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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.