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Finding the Fourth Proportional to 855.70, 1,179.47 and 668.86

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Solution

The fourth proportional to 855.70, 1,179.47 and 668.86 is: 921.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.70 : 1,179.47 = 668.86 : x
  2. Step 2: Convert to fraction form
    855.70/1,179.47 = 668.86/x
  3. Step 3: Cross multiply
    855.70x = 1,179.47 × 668.86
  4. Step 4: Simplify right side
    855.70x = 788,899.03
  5. Step 5: Solve for x
    x = 788,899.03/855.70
  6. Step 6: Final answer
    x = 921.94

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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.