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Finding the Fourth Proportional to 1,320.64, 1,821.69 and 872.52

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Solution

The fourth proportional to 1,320.64, 1,821.69 and 872.52 is: 1,203.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,320.64 : 1,821.69 = 872.52 : x
  2. Step 2: Convert to fraction form
    1,320.64/1,821.69 = 872.52/x
  3. Step 3: Cross multiply
    1,320.64x = 1,821.69 × 872.52
  4. Step 4: Simplify right side
    1,320.64x = 1,589,460.96
  5. Step 5: Solve for x
    x = 1,589,460.96/1,320.64
  6. Step 6: Final answer
    x = 1,203.55

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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.