Home / 1,299.10-1,939.40-1,253.54

Finding the Fourth Proportional to 1,299.10, 1,939.40 and 1,253.54

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Solution

The fourth proportional to 1,299.10, 1,939.40 and 1,253.54 is: 1,871.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,299.10 : 1,939.40 = 1,253.54 : x
  2. Step 2: Convert to fraction form
    1,299.10/1,939.40 = 1,253.54/x
  3. Step 3: Cross multiply
    1,299.10x = 1,939.40 × 1,253.54
  4. Step 4: Simplify right side
    1,299.10x = 2,431,115.48
  5. Step 5: Solve for x
    x = 2,431,115.48/1,299.10
  6. Step 6: Final answer
    x = 1,871.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.