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Finding the Fourth Proportional to 1,818.44, 2,509.45 and 990.44

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Solution

The fourth proportional to 1,818.44, 2,509.45 and 990.44 is: 1,366.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.44 : 2,509.45 = 990.44 : x
  2. Step 2: Convert to fraction form
    1,818.44/2,509.45 = 990.44/x
  3. Step 3: Cross multiply
    1,818.44x = 2,509.45 × 990.44
  4. Step 4: Simplify right side
    1,818.44x = 2,485,454.71
  5. Step 5: Solve for x
    x = 2,485,454.71/1,818.44
  6. Step 6: Final answer
    x = 1,366.81

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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.