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Finding the Fourth Proportional to 2,990.76, 4,126.05 and 1,811.40

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Solution

The fourth proportional to 2,990.76, 4,126.05 and 1,811.40 is: 2,499.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990.76 : 4,126.05 = 1,811.40 : x
  2. Step 2: Convert to fraction form
    2,990.76/4,126.05 = 1,811.40/x
  3. Step 3: Cross multiply
    2,990.76x = 4,126.05 × 1,811.40
  4. Step 4: Simplify right side
    2,990.76x = 7,473,926.97
  5. Step 5: Solve for x
    x = 7,473,926.97/2,990.76
  6. Step 6: Final answer
    x = 2,499.01

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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.