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Finding the Fourth Proportional to 1,218.64, 1,828.20 and 1,003.12

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Solution

The fourth proportional to 1,218.64, 1,828.20 and 1,003.12 is: 1,504.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,218.64 : 1,828.20 = 1,003.12 : x
  2. Step 2: Convert to fraction form
    1,218.64/1,828.20 = 1,003.12/x
  3. Step 3: Cross multiply
    1,218.64x = 1,828.20 × 1,003.12
  4. Step 4: Simplify right side
    1,218.64x = 1,833,903.98
  5. Step 5: Solve for x
    x = 1,833,903.98/1,218.64
  6. Step 6: Final answer
    x = 1,504.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.