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Finding the Fourth Proportional to 858.15, 1,286.16 and 447.05

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Solution

The fourth proportional to 858.15, 1,286.16 and 447.05 is: 670.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    858.15 : 1,286.16 = 447.05 : x
  2. Step 2: Convert to fraction form
    858.15/1,286.16 = 447.05/x
  3. Step 3: Cross multiply
    858.15x = 1,286.16 × 447.05
  4. Step 4: Simplify right side
    858.15x = 574,971.40
  5. Step 5: Solve for x
    x = 574,971.40/858.15
  6. Step 6: Final answer
    x = 670.01

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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.