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Finding the Fourth Proportional to 2,938.36, 4,406.86 and 857.90

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Solution

The fourth proportional to 2,938.36, 4,406.86 and 857.90 is: 1,286.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.36 : 4,406.86 = 857.90 : x
  2. Step 2: Convert to fraction form
    2,938.36/4,406.86 = 857.90/x
  3. Step 3: Cross multiply
    2,938.36x = 4,406.86 × 857.90
  4. Step 4: Simplify right side
    2,938.36x = 3,780,645.19
  5. Step 5: Solve for x
    x = 3,780,645.19/2,938.36
  6. Step 6: Final answer
    x = 1,286.65

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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.