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Finding the Fourth Proportional to 817.82, 1,128.60 and 486.28

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Solution

The fourth proportional to 817.82, 1,128.60 and 486.28 is: 671.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.82 : 1,128.60 = 486.28 : x
  2. Step 2: Convert to fraction form
    817.82/1,128.60 = 486.28/x
  3. Step 3: Cross multiply
    817.82x = 1,128.60 × 486.28
  4. Step 4: Simplify right side
    817.82x = 548,815.61
  5. Step 5: Solve for x
    x = 548,815.61/817.82
  6. Step 6: Final answer
    x = 671.07

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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.