Home / 1,390.40-2,076.22-1,208.24

Finding the Fourth Proportional to 1,390.40, 2,076.22 and 1,208.24

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Solution

The fourth proportional to 1,390.40, 2,076.22 and 1,208.24 is: 1,804.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.40 : 2,076.22 = 1,208.24 : x
  2. Step 2: Convert to fraction form
    1,390.40/2,076.22 = 1,208.24/x
  3. Step 3: Cross multiply
    1,390.40x = 2,076.22 × 1,208.24
  4. Step 4: Simplify right side
    1,390.40x = 2,508,572.05
  5. Step 5: Solve for x
    x = 2,508,572.05/1,390.40
  6. Step 6: Final answer
    x = 1,804.21

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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.