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Finding the Fourth Proportional to 858.80, 1,286.04 and 666.56

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Solution

The fourth proportional to 858.80, 1,286.04 and 666.56 is: 998.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.80 : 1,286.04 = 666.56 : x
  2. Step 2: Convert to fraction form
    858.80/1,286.04 = 666.56/x
  3. Step 3: Cross multiply
    858.80x = 1,286.04 × 666.56
  4. Step 4: Simplify right side
    858.80x = 857,222.82
  5. Step 5: Solve for x
    x = 857,222.82/858.80
  6. Step 6: Final answer
    x = 998.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.