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Finding the Fourth Proportional to 1,953.23, 2,930.99 and 721.50

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Solution

The fourth proportional to 1,953.23, 2,930.99 and 721.50 is: 1,082.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,953.23 : 2,930.99 = 721.50 : x
  2. Step 2: Convert to fraction form
    1,953.23/2,930.99 = 721.50/x
  3. Step 3: Cross multiply
    1,953.23x = 2,930.99 × 721.50
  4. Step 4: Simplify right side
    1,953.23x = 2,114,709.29
  5. Step 5: Solve for x
    x = 2,114,709.29/1,953.23
  6. Step 6: Final answer
    x = 1,082.67

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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.