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Finding the Fourth Proportional to 923.90, 1,379.37 and 842.90

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Solution

The fourth proportional to 923.90, 1,379.37 and 842.90 is: 1,258.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.90 : 1,379.37 = 842.90 : x
  2. Step 2: Convert to fraction form
    923.90/1,379.37 = 842.90/x
  3. Step 3: Cross multiply
    923.90x = 1,379.37 × 842.90
  4. Step 4: Simplify right side
    923.90x = 1,162,666.76
  5. Step 5: Solve for x
    x = 1,162,666.76/923.90
  6. Step 6: Final answer
    x = 1,258.43

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.