Home / 1,129.38-1,694.40-480.16

Finding the Fourth Proportional to 1,129.38, 1,694.40 and 480.16

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Solution

The fourth proportional to 1,129.38, 1,694.40 and 480.16 is: 720.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.38 : 1,694.40 = 480.16 : x
  2. Step 2: Convert to fraction form
    1,129.38/1,694.40 = 480.16/x
  3. Step 3: Cross multiply
    1,129.38x = 1,694.40 × 480.16
  4. Step 4: Simplify right side
    1,129.38x = 813,583.10
  5. Step 5: Solve for x
    x = 813,583.10/1,129.38
  6. Step 6: Final answer
    x = 720.38

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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.