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Finding the Fourth Proportional to 1,628.81, 2,247.74 and 990.53

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Solution

The fourth proportional to 1,628.81, 2,247.74 and 990.53 is: 1,366.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,628.81 : 2,247.74 = 990.53 : x
  2. Step 2: Convert to fraction form
    1,628.81/2,247.74 = 990.53/x
  3. Step 3: Cross multiply
    1,628.81x = 2,247.74 × 990.53
  4. Step 4: Simplify right side
    1,628.81x = 2,226,448.95
  5. Step 5: Solve for x
    x = 2,226,448.95/1,628.81
  6. Step 6: Final answer
    x = 1,366.92

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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.