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Finding the Fourth Proportional to 1,301.11, 1,948.42 and 812.68

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Solution

The fourth proportional to 1,301.11, 1,948.42 and 812.68 is: 1,216.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,301.11 : 1,948.42 = 812.68 : x
  2. Step 2: Convert to fraction form
    1,301.11/1,948.42 = 812.68/x
  3. Step 3: Cross multiply
    1,301.11x = 1,948.42 × 812.68
  4. Step 4: Simplify right side
    1,301.11x = 1,583,441.97
  5. Step 5: Solve for x
    x = 1,583,441.97/1,301.11
  6. Step 6: Final answer
    x = 1,216.99

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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.