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Finding the Fourth Proportional to 1,325.73, 1,978.80 and 1,243.65

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Solution

The fourth proportional to 1,325.73, 1,978.80 and 1,243.65 is: 1,856.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,325.73 : 1,978.80 = 1,243.65 : x
  2. Step 2: Convert to fraction form
    1,325.73/1,978.80 = 1,243.65/x
  3. Step 3: Cross multiply
    1,325.73x = 1,978.80 × 1,243.65
  4. Step 4: Simplify right side
    1,325.73x = 2,460,934.62
  5. Step 5: Solve for x
    x = 2,460,934.62/1,325.73
  6. Step 6: Final answer
    x = 1,856.29

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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.