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Finding the Fourth Proportional to 2,939.74, 4,409.45 and 859.70

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Solution

The fourth proportional to 2,939.74, 4,409.45 and 859.70 is: 1,289.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,939.74 : 4,409.45 = 859.70 : x
  2. Step 2: Convert to fraction form
    2,939.74/4,409.45 = 859.70/x
  3. Step 3: Cross multiply
    2,939.74x = 4,409.45 × 859.70
  4. Step 4: Simplify right side
    2,939.74x = 3,790,810.89
  5. Step 5: Solve for x
    x = 3,790,810.89/2,939.74
  6. Step 6: Final answer
    x = 1,289.51

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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.