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Finding the Fourth Proportional to 855.01, 1,178.31 and 668.20

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Solution

The fourth proportional to 855.01, 1,178.31 and 668.20 is: 920.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    855.01 : 1,178.31 = 668.20 : x
  2. Step 2: Convert to fraction form
    855.01/1,178.31 = 668.20/x
  3. Step 3: Cross multiply
    855.01x = 1,178.31 × 668.20
  4. Step 4: Simplify right side
    855.01x = 787,348.51
  5. Step 5: Solve for x
    x = 787,348.51/855.01
  6. Step 6: Final answer
    x = 920.87

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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.