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Finding the Fourth Proportional to 2,121.86, 3,182.95 and 889.09

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Solution

The fourth proportional to 2,121.86, 3,182.95 and 889.09 is: 1,333.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.86 : 3,182.95 = 889.09 : x
  2. Step 2: Convert to fraction form
    2,121.86/3,182.95 = 889.09/x
  3. Step 3: Cross multiply
    2,121.86x = 3,182.95 × 889.09
  4. Step 4: Simplify right side
    2,121.86x = 2,829,935.07
  5. Step 5: Solve for x
    x = 2,829,935.07/2,121.86
  6. Step 6: Final answer
    x = 1,333.70

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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.