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Finding the Fourth Proportional to 816.97, 1,127.38 and 485.27

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Solution

The fourth proportional to 816.97, 1,127.38 and 485.27 is: 669.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.97 : 1,127.38 = 485.27 : x
  2. Step 2: Convert to fraction form
    816.97/1,127.38 = 485.27/x
  3. Step 3: Cross multiply
    816.97x = 1,127.38 × 485.27
  4. Step 4: Simplify right side
    816.97x = 547,083.69
  5. Step 5: Solve for x
    x = 547,083.69/816.97
  6. Step 6: Final answer
    x = 669.65

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1.5x scale

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.