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Finding the Fourth Proportional to 817.72, 1,127.46 and 712.42

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Solution

The fourth proportional to 817.72, 1,127.46 and 712.42 is: 982.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.72 : 1,127.46 = 712.42 : x
  2. Step 2: Convert to fraction form
    817.72/1,127.46 = 712.42/x
  3. Step 3: Cross multiply
    817.72x = 1,127.46 × 712.42
  4. Step 4: Simplify right side
    817.72x = 803,225.05
  5. Step 5: Solve for x
    x = 803,225.05/817.72
  6. Step 6: Final answer
    x = 982.27

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.