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Finding the Fourth Proportional to 1,953.41, 2,930.21 and 721.19

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Solution

The fourth proportional to 1,953.41, 2,930.21 and 721.19 is: 1,081.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,953.41 : 2,930.21 = 721.19 : x
  2. Step 2: Convert to fraction form
    1,953.41/2,930.21 = 721.19/x
  3. Step 3: Cross multiply
    1,953.41x = 2,930.21 × 721.19
  4. Step 4: Simplify right side
    1,953.41x = 2,113,219.89
  5. Step 5: Solve for x
    x = 2,113,219.89/1,953.41
  6. Step 6: Final answer
    x = 1,081.81

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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.