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Finding the Fourth Proportional to 855.76, 1,179.55 and 668.92

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Solution

The fourth proportional to 855.76, 1,179.55 and 668.92 is: 922.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.76 : 1,179.55 = 668.92 : x
  2. Step 2: Convert to fraction form
    855.76/1,179.55 = 668.92/x
  3. Step 3: Cross multiply
    855.76x = 1,179.55 × 668.92
  4. Step 4: Simplify right side
    855.76x = 789,024.59
  5. Step 5: Solve for x
    x = 789,024.59/855.76
  6. Step 6: Final answer
    x = 922.02

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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.