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Finding the Fourth Proportional to 2,990.34, 4,126.86 and 1,811.70

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Solution

The fourth proportional to 2,990.34, 4,126.86 and 1,811.70 is: 2,500.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.34 : 4,126.86 = 1,811.70 : x
  2. Step 2: Convert to fraction form
    2,990.34/4,126.86 = 1,811.70/x
  3. Step 3: Cross multiply
    2,990.34x = 4,126.86 × 1,811.70
  4. Step 4: Simplify right side
    2,990.34x = 7,476,632.26
  5. Step 5: Solve for x
    x = 7,476,632.26/2,990.34
  6. Step 6: Final answer
    x = 2,500.26

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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.