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Finding the Fourth Proportional to 2,938.68, 4,405.19 and 989.82

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Solution

The fourth proportional to 2,938.68, 4,405.19 and 989.82 is: 1,483.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,938.68 : 4,405.19 = 989.82 : x
  2. Step 2: Convert to fraction form
    2,938.68/4,405.19 = 989.82/x
  3. Step 3: Cross multiply
    2,938.68x = 4,405.19 × 989.82
  4. Step 4: Simplify right side
    2,938.68x = 4,360,340.22
  5. Step 5: Solve for x
    x = 4,360,340.22/2,938.68
  6. Step 6: Final answer
    x = 1,483.78

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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.