Home / 2,106.14-2,905.47-1,398.20

Finding the Fourth Proportional to 2,106.14, 2,905.47 and 1,398.20

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Solution

The fourth proportional to 2,106.14, 2,905.47 and 1,398.20 is: 1,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,106.14 : 2,905.47 = 1,398.20 : x
  2. Step 2: Convert to fraction form
    2,106.14/2,905.47 = 1,398.20/x
  3. Step 3: Cross multiply
    2,106.14x = 2,905.47 × 1,398.20
  4. Step 4: Simplify right side
    2,106.14x = 4,062,413.63
  5. Step 5: Solve for x
    x = 4,062,413.63/2,106.14
  6. Step 6: Final answer
    x = 1,928.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.