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Finding the Fourth Proportional to 1,953.42, 2,930.85 and 721.65

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Solution

The fourth proportional to 1,953.42, 2,930.85 and 721.65 is: 1,082.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,953.42 : 2,930.85 = 721.65 : x
  2. Step 2: Convert to fraction form
    1,953.42/2,930.85 = 721.65/x
  3. Step 3: Cross multiply
    1,953.42x = 2,930.85 × 721.65
  4. Step 4: Simplify right side
    1,953.42x = 2,115,047.90
  5. Step 5: Solve for x
    x = 2,115,047.90/1,953.42
  6. Step 6: Final answer
    x = 1,082.74

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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.