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Finding the Fourth Proportional to 1,328.07, 1,990.74 and 450.28

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Solution

The fourth proportional to 1,328.07, 1,990.74 and 450.28 is: 674.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.07 : 1,990.74 = 450.28 : x
  2. Step 2: Convert to fraction form
    1,328.07/1,990.74 = 450.28/x
  3. Step 3: Cross multiply
    1,328.07x = 1,990.74 × 450.28
  4. Step 4: Simplify right side
    1,328.07x = 896,390.41
  5. Step 5: Solve for x
    x = 896,390.41/1,328.07
  6. Step 6: Final answer
    x = 674.96

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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.