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Finding the Fourth Proportional to 1,397.08, 2,093.72 and 665.65

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Solution

The fourth proportional to 1,397.08, 2,093.72 and 665.65 is: 997.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,397.08 : 2,093.72 = 665.65 : x
  2. Step 2: Convert to fraction form
    1,397.08/2,093.72 = 665.65/x
  3. Step 3: Cross multiply
    1,397.08x = 2,093.72 × 665.65
  4. Step 4: Simplify right side
    1,397.08x = 1,393,674.25
  5. Step 5: Solve for x
    x = 1,393,674.25/1,397.08
  6. Step 6: Final answer
    x = 997.57

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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.