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Finding the Fourth Proportional to 1,983.47, 2,972.86 and 812.75

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Solution

The fourth proportional to 1,983.47, 2,972.86 and 812.75 is: 1,218.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,983.47 : 2,972.86 = 812.75 : x
  2. Step 2: Convert to fraction form
    1,983.47/2,972.86 = 812.75/x
  3. Step 3: Cross multiply
    1,983.47x = 2,972.86 × 812.75
  4. Step 4: Simplify right side
    1,983.47x = 2,416,175.07
  5. Step 5: Solve for x
    x = 2,416,175.07/1,983.47
  6. Step 6: Final answer
    x = 1,218.16

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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.