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Finding the Fourth Proportional to 1,811.45, 2,718.71 and 990.30

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Solution

The fourth proportional to 1,811.45, 2,718.71 and 990.30 is: 1,486.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.45 : 2,718.71 = 990.30 : x
  2. Step 2: Convert to fraction form
    1,811.45/2,718.71 = 990.30/x
  3. Step 3: Cross multiply
    1,811.45x = 2,718.71 × 990.30
  4. Step 4: Simplify right side
    1,811.45x = 2,692,345.39
  5. Step 5: Solve for x
    x = 2,692,345.39/1,811.45
  6. Step 6: Final answer
    x = 1,486.29

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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.