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Finding the Fourth Proportional to 817.43, 1,127.90 and 485.96

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Solution

The fourth proportional to 817.43, 1,127.90 and 485.96 is: 670.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.43 : 1,127.90 = 485.96 : x
  2. Step 2: Convert to fraction form
    817.43/1,127.90 = 485.96/x
  3. Step 3: Cross multiply
    817.43x = 1,127.90 × 485.96
  4. Step 4: Simplify right side
    817.43x = 548,111.85
  5. Step 5: Solve for x
    x = 548,111.85/817.43
  6. Step 6: Final answer
    x = 670.53

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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.