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Finding the Fourth Proportional to 817.75, 1,128.26 and 486.01

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Solution

The fourth proportional to 817.75, 1,128.26 and 486.01 is: 670.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.75 : 1,128.26 = 486.01 : x
  2. Step 2: Convert to fraction form
    817.75/1,128.26 = 486.01/x
  3. Step 3: Cross multiply
    817.75x = 1,128.26 × 486.01
  4. Step 4: Simplify right side
    817.75x = 548,343.21
  5. Step 5: Solve for x
    x = 548,343.21/817.75
  6. Step 6: Final answer
    x = 670.55

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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.