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Finding the Fourth Proportional to 1,373.31, 1,891.08 and 1,221.75

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Solution

The fourth proportional to 1,373.31, 1,891.08 and 1,221.75 is: 1,682.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,373.31 : 1,891.08 = 1,221.75 : x
  2. Step 2: Convert to fraction form
    1,373.31/1,891.08 = 1,221.75/x
  3. Step 3: Cross multiply
    1,373.31x = 1,891.08 × 1,221.75
  4. Step 4: Simplify right side
    1,373.31x = 2,310,426.99
  5. Step 5: Solve for x
    x = 2,310,426.99/1,373.31
  6. Step 6: Final answer
    x = 1,682.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.