Home / 1,391.84-2,074.36-1,389.68

Finding the Fourth Proportional to 1,391.84, 2,074.36 and 1,389.68

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Solution

The fourth proportional to 1,391.84, 2,074.36 and 1,389.68 is: 2,071.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.84 : 2,074.36 = 1,389.68 : x
  2. Step 2: Convert to fraction form
    1,391.84/2,074.36 = 1,389.68/x
  3. Step 3: Cross multiply
    1,391.84x = 2,074.36 × 1,389.68
  4. Step 4: Simplify right side
    1,391.84x = 2,882,696.60
  5. Step 5: Solve for x
    x = 2,882,696.60/1,391.84
  6. Step 6: Final answer
    x = 2,071.14

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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.