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Finding the Fourth Proportional to 1,397.05, 1,928.21 and 1,064.88

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Solution

The fourth proportional to 1,397.05, 1,928.21 and 1,064.88 is: 1,469.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.05 : 1,928.21 = 1,064.88 : x
  2. Step 2: Convert to fraction form
    1,397.05/1,928.21 = 1,064.88/x
  3. Step 3: Cross multiply
    1,397.05x = 1,928.21 × 1,064.88
  4. Step 4: Simplify right side
    1,397.05x = 2,053,306.94
  5. Step 5: Solve for x
    x = 2,053,306.94/1,397.05
  6. Step 6: Final answer
    x = 1,469.75

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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.