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Finding the Fourth Proportional to 1,214.64, 1,674.48 and 1,003.92

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Solution

The fourth proportional to 1,214.64, 1,674.48 and 1,003.92 is: 1,383.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,214.64 : 1,674.48 = 1,003.92 : x
  2. Step 2: Convert to fraction form
    1,214.64/1,674.48 = 1,003.92/x
  3. Step 3: Cross multiply
    1,214.64x = 1,674.48 × 1,003.92
  4. Step 4: Simplify right side
    1,214.64x = 1,681,043.96
  5. Step 5: Solve for x
    x = 1,681,043.96/1,214.64
  6. Step 6: Final answer
    x = 1,383.99

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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.