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Finding the Fourth Proportional to 2,318.63, 3,479.31 and 858.80

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Solution

The fourth proportional to 2,318.63, 3,479.31 and 858.80 is: 1,288.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,318.63 : 3,479.31 = 858.80 : x
  2. Step 2: Convert to fraction form
    2,318.63/3,479.31 = 858.80/x
  3. Step 3: Cross multiply
    2,318.63x = 3,479.31 × 858.80
  4. Step 4: Simplify right side
    2,318.63x = 2,988,031.43
  5. Step 5: Solve for x
    x = 2,988,031.43/2,318.63
  6. Step 6: Final answer
    x = 1,288.71

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1.5x scale

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.