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Finding the Fourth Proportional to 923.81, 1,387.53 and 891

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Solution

The fourth proportional to 923.81, 1,387.53 and 891 is: 1,338.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.81 : 1,387.53 = 891 : x
  2. Step 2: Convert to fraction form
    923.81/1,387.53 = 891/x
  3. Step 3: Cross multiply
    923.81x = 1,387.53 × 891
  4. Step 4: Simplify right side
    923.81x = 1,236,289.23
  5. Step 5: Solve for x
    x = 1,236,289.23/923.81
  6. Step 6: Final answer
    x = 1,338.26

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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.