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Finding the Fourth Proportional to 1,424.64, 1,965.44 and 872.96

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Solution

The fourth proportional to 1,424.64, 1,965.44 and 872.96 is: 1,204.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,424.64 : 1,965.44 = 872.96 : x
  2. Step 2: Convert to fraction form
    1,424.64/1,965.44 = 872.96/x
  3. Step 3: Cross multiply
    1,424.64x = 1,965.44 × 872.96
  4. Step 4: Simplify right side
    1,424.64x = 1,715,750.50
  5. Step 5: Solve for x
    x = 1,715,750.50/1,424.64
  6. Step 6: Final answer
    x = 1,204.34

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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.