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Finding the Fourth Proportional to 1,620.91, 2,431.70 and 696.57

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Solution

The fourth proportional to 1,620.91, 2,431.70 and 696.57 is: 1,045.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,620.91 : 2,431.70 = 696.57 : x
  2. Step 2: Convert to fraction form
    1,620.91/2,431.70 = 696.57/x
  3. Step 3: Cross multiply
    1,620.91x = 2,431.70 × 696.57
  4. Step 4: Simplify right side
    1,620.91x = 1,693,849.27
  5. Step 5: Solve for x
    x = 1,693,849.27/1,620.91
  6. Step 6: Final answer
    x = 1,045.00

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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.