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Finding the Fourth Proportional to 1,368.64, 2,049.31 and 820.07

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Solution

The fourth proportional to 1,368.64, 2,049.31 and 820.07 is: 1,227.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,368.64 : 2,049.31 = 820.07 : x
  2. Step 2: Convert to fraction form
    1,368.64/2,049.31 = 820.07/x
  3. Step 3: Cross multiply
    1,368.64x = 2,049.31 × 820.07
  4. Step 4: Simplify right side
    1,368.64x = 1,680,565.35
  5. Step 5: Solve for x
    x = 1,680,565.35/1,368.64
  6. Step 6: Final answer
    x = 1,227.91

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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.