Home / 1,240.14-1,860.39-418.21

Finding the Fourth Proportional to 1,240.14, 1,860.39 and 418.21

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Solution

The fourth proportional to 1,240.14, 1,860.39 and 418.21 is: 627.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,240.14 : 1,860.39 = 418.21 : x
  2. Step 2: Convert to fraction form
    1,240.14/1,860.39 = 418.21/x
  3. Step 3: Cross multiply
    1,240.14x = 1,860.39 × 418.21
  4. Step 4: Simplify right side
    1,240.14x = 778,033.70
  5. Step 5: Solve for x
    x = 778,033.70/1,240.14
  6. Step 6: Final answer
    x = 627.38

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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.