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Finding the Fourth Proportional to 1,299.53, 1,949.40 and 433.85

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Solution

The fourth proportional to 1,299.53, 1,949.40 and 433.85 is: 650.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.53 : 1,949.40 = 433.85 : x
  2. Step 2: Convert to fraction form
    1,299.53/1,949.40 = 433.85/x
  3. Step 3: Cross multiply
    1,299.53x = 1,949.40 × 433.85
  4. Step 4: Simplify right side
    1,299.53x = 845,736.36
  5. Step 5: Solve for x
    x = 845,736.36/1,299.53
  6. Step 6: Final answer
    x = 650.80

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Double scale
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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.