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Finding the Fourth Proportional to 923.11, 1,381.47 and 571.57

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Solution

The fourth proportional to 923.11, 1,381.47 and 571.57 is: 855.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.11 : 1,381.47 = 571.57 : x
  2. Step 2: Convert to fraction form
    923.11/1,381.47 = 571.57/x
  3. Step 3: Cross multiply
    923.11x = 1,381.47 × 571.57
  4. Step 4: Simplify right side
    923.11x = 789,606.81
  5. Step 5: Solve for x
    x = 789,606.81/923.11
  6. Step 6: Final answer
    x = 855.38

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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.