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Finding the Fourth Proportional to 1,392.57, 2,089.26 and 807.44

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Solution

The fourth proportional to 1,392.57, 2,089.26 and 807.44 is: 1,211.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.57 : 2,089.26 = 807.44 : x
  2. Step 2: Convert to fraction form
    1,392.57/2,089.26 = 807.44/x
  3. Step 3: Cross multiply
    1,392.57x = 2,089.26 × 807.44
  4. Step 4: Simplify right side
    1,392.57x = 1,686,941.65
  5. Step 5: Solve for x
    x = 1,686,941.65/1,392.57
  6. Step 6: Final answer
    x = 1,211.39

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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.