Home / 1,425.51-2,138.46-438.12

Finding the Fourth Proportional to 1,425.51, 2,138.46 and 438.12

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Solution

The fourth proportional to 1,425.51, 2,138.46 and 438.12 is: 657.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,425.51 : 2,138.46 = 438.12 : x
  2. Step 2: Convert to fraction form
    1,425.51/2,138.46 = 438.12/x
  3. Step 3: Cross multiply
    1,425.51x = 2,138.46 × 438.12
  4. Step 4: Simplify right side
    1,425.51x = 936,902.10
  5. Step 5: Solve for x
    x = 936,902.10/1,425.51
  6. Step 6: Final answer
    x = 657.24

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Half scale
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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.