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Finding the Fourth Proportional to 817.92, 1,127.21 and 581.87

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Solution

The fourth proportional to 817.92, 1,127.21 and 581.87 is: 801.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.92 : 1,127.21 = 581.87 : x
  2. Step 2: Convert to fraction form
    817.92/1,127.21 = 581.87/x
  3. Step 3: Cross multiply
    817.92x = 1,127.21 × 581.87
  4. Step 4: Simplify right side
    817.92x = 655,889.59
  5. Step 5: Solve for x
    x = 655,889.59/817.92
  6. Step 6: Final answer
    x = 801.90

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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.