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Finding the Fourth Proportional to 2,891.45, 3,990.20 and 1,712.60

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Solution

The fourth proportional to 2,891.45, 3,990.20 and 1,712.60 is: 2,363.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,891.45 : 3,990.20 = 1,712.60 : x
  2. Step 2: Convert to fraction form
    2,891.45/3,990.20 = 1,712.60/x
  3. Step 3: Cross multiply
    2,891.45x = 3,990.20 × 1,712.60
  4. Step 4: Simplify right side
    2,891.45x = 6,833,588.01
  5. Step 5: Solve for x
    x = 6,833,588.01/2,891.45
  6. Step 6: Final answer
    x = 2,363.38

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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.