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Finding the Fourth Proportional to 817.24, 1,127.94 and 485.86

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Solution

The fourth proportional to 817.24, 1,127.94 and 485.86 is: 670.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.24 : 1,127.94 = 485.86 : x
  2. Step 2: Convert to fraction form
    817.24/1,127.94 = 485.86/x
  3. Step 3: Cross multiply
    817.24x = 1,127.94 × 485.86
  4. Step 4: Simplify right side
    817.24x = 548,020.93
  5. Step 5: Solve for x
    x = 548,020.93/817.24
  6. Step 6: Final answer
    x = 670.58

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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.