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Finding the Fourth Proportional to 1,390.12, 1,920.90 and 1,322.64

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Solution

The fourth proportional to 1,390.12, 1,920.90 and 1,322.64 is: 1,827.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.12 : 1,920.90 = 1,322.64 : x
  2. Step 2: Convert to fraction form
    1,390.12/1,920.90 = 1,322.64/x
  3. Step 3: Cross multiply
    1,390.12x = 1,920.90 × 1,322.64
  4. Step 4: Simplify right side
    1,390.12x = 2,540,659.18
  5. Step 5: Solve for x
    x = 2,540,659.18/1,390.12
  6. Step 6: Final answer
    x = 1,827.65

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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.