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Finding the Fourth Proportional to 920.57, 1,383.89 and 891.41

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Solution

The fourth proportional to 920.57, 1,383.89 and 891.41 is: 1,340.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.57 : 1,383.89 = 891.41 : x
  2. Step 2: Convert to fraction form
    920.57/1,383.89 = 891.41/x
  3. Step 3: Cross multiply
    920.57x = 1,383.89 × 891.41
  4. Step 4: Simplify right side
    920.57x = 1,233,602.01
  5. Step 5: Solve for x
    x = 1,233,602.01/920.57
  6. Step 6: Final answer
    x = 1,340.05

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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.