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Finding the Fourth Proportional to 1,393.20, 2,081.70 and 1,393.20

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Solution

The fourth proportional to 1,393.20, 2,081.70 and 1,393.20 is: 2,081.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,393.20 : 2,081.70 = 1,393.20 : x
  2. Step 2: Convert to fraction form
    1,393.20/2,081.70 = 1,393.20/x
  3. Step 3: Cross multiply
    1,393.20x = 2,081.70 × 1,393.20
  4. Step 4: Simplify right side
    1,393.20x = 2,900,224.44
  5. Step 5: Solve for x
    x = 2,900,224.44/1,393.20
  6. Step 6: Final answer
    x = 2,081.70

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.