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Finding the Fourth Proportional to 921.40, 1,383.70 and 892.60

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Solution

The fourth proportional to 921.40, 1,383.70 and 892.60 is: 1,340.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.40 : 1,383.70 = 892.60 : x
  2. Step 2: Convert to fraction form
    921.40/1,383.70 = 892.60/x
  3. Step 3: Cross multiply
    921.40x = 1,383.70 × 892.60
  4. Step 4: Simplify right side
    921.40x = 1,235,090.62
  5. Step 5: Solve for x
    x = 1,235,090.62/921.40
  6. Step 6: Final answer
    x = 1,340.45

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.