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Finding the Fourth Proportional to 1,818.70, 2,509.81 and 990.70

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Solution

The fourth proportional to 1,818.70, 2,509.81 and 990.70 is: 1,367.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.70 : 2,509.81 = 990.70 : x
  2. Step 2: Convert to fraction form
    1,818.70/2,509.81 = 990.70/x
  3. Step 3: Cross multiply
    1,818.70x = 2,509.81 × 990.70
  4. Step 4: Simplify right side
    1,818.70x = 2,486,476.92
  5. Step 5: Solve for x
    x = 2,486,476.92/1,818.70
  6. Step 6: Final answer
    x = 1,367.17

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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.