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Finding the Fourth Proportional to 1,420.46, 1,959.81 and 923.66

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Solution

The fourth proportional to 1,420.46, 1,959.81 and 923.66 is: 1,274.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.46 : 1,959.81 = 923.66 : x
  2. Step 2: Convert to fraction form
    1,420.46/1,959.81 = 923.66/x
  3. Step 3: Cross multiply
    1,420.46x = 1,959.81 × 923.66
  4. Step 4: Simplify right side
    1,420.46x = 1,810,198.10
  5. Step 5: Solve for x
    x = 1,810,198.10/1,420.46
  6. Step 6: Final answer
    x = 1,274.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.