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Finding the Fourth Proportional to 1,818.28, 2,509.26 and 990.28

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Solution

The fourth proportional to 1,818.28, 2,509.26 and 990.28 is: 1,366.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,818.28 : 2,509.26 = 990.28 : x
  2. Step 2: Convert to fraction form
    1,818.28/2,509.26 = 990.28/x
  3. Step 3: Cross multiply
    1,818.28x = 2,509.26 × 990.28
  4. Step 4: Simplify right side
    1,818.28x = 2,484,869.99
  5. Step 5: Solve for x
    x = 2,484,869.99/1,818.28
  6. Step 6: Final answer
    x = 1,366.60

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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.