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Finding the Fourth Proportional to 1,442.56, 1,991.64 and 945.92

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Solution

The fourth proportional to 1,442.56, 1,991.64 and 945.92 is: 1,305.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.56 : 1,991.64 = 945.92 : x
  2. Step 2: Convert to fraction form
    1,442.56/1,991.64 = 945.92/x
  3. Step 3: Cross multiply
    1,442.56x = 1,991.64 × 945.92
  4. Step 4: Simplify right side
    1,442.56x = 1,883,932.11
  5. Step 5: Solve for x
    x = 1,883,932.11/1,442.56
  6. Step 6: Final answer
    x = 1,305.96

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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.