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Finding the Fourth Proportional to 1,953, 2,930.64 and 721.26

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Solution

The fourth proportional to 1,953, 2,930.64 and 721.26 is: 1,082.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,953 : 2,930.64 = 721.26 : x
  2. Step 2: Convert to fraction form
    1,953/2,930.64 = 721.26/x
  3. Step 3: Cross multiply
    1,953x = 2,930.64 × 721.26
  4. Step 4: Simplify right side
    1,953x = 2,113,753.41
  5. Step 5: Solve for x
    x = 2,113,753.41/1,953
  6. Step 6: Final answer
    x = 1,082.31

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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.