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Finding the Fourth Proportional to 1,328.06, 1,989.87 and 634.58

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Solution

The fourth proportional to 1,328.06, 1,989.87 and 634.58 is: 950.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.06 : 1,989.87 = 634.58 : x
  2. Step 2: Convert to fraction form
    1,328.06/1,989.87 = 634.58/x
  3. Step 3: Cross multiply
    1,328.06x = 1,989.87 × 634.58
  4. Step 4: Simplify right side
    1,328.06x = 1,262,731.70
  5. Step 5: Solve for x
    x = 1,262,731.70/1,328.06
  6. Step 6: Final answer
    x = 950.81

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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.