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Finding the Fourth Proportional to 1,299.63, 1,949.07 and 641.10

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Solution

The fourth proportional to 1,299.63, 1,949.07 and 641.10 is: 961.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.63 : 1,949.07 = 641.10 : x
  2. Step 2: Convert to fraction form
    1,299.63/1,949.07 = 641.10/x
  3. Step 3: Cross multiply
    1,299.63x = 1,949.07 × 641.10
  4. Step 4: Simplify right side
    1,299.63x = 1,249,548.78
  5. Step 5: Solve for x
    x = 1,249,548.78/1,299.63
  6. Step 6: Final answer
    x = 961.47

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1.5x scale

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.