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Finding the Fourth Proportional to 974.49, 1,346.10 and 809.55

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Solution

The fourth proportional to 974.49, 1,346.10 and 809.55 is: 1,118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    974.49 : 1,346.10 = 809.55 : x
  2. Step 2: Convert to fraction form
    974.49/1,346.10 = 809.55/x
  3. Step 3: Cross multiply
    974.49x = 1,346.10 × 809.55
  4. Step 4: Simplify right side
    974.49x = 1,089,735.26
  5. Step 5: Solve for x
    x = 1,089,735.26/974.49
  6. Step 6: Final answer
    x = 1,118.26

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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.