Home / 1,389.12-2,074.66-1,258.86

Finding the Fourth Proportional to 1,389.12, 2,074.66 and 1,258.86

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Solution

The fourth proportional to 1,389.12, 2,074.66 and 1,258.86 is: 1,880.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,389.12 : 2,074.66 = 1,258.86 : x
  2. Step 2: Convert to fraction form
    1,389.12/2,074.66 = 1,258.86/x
  3. Step 3: Cross multiply
    1,389.12x = 2,074.66 × 1,258.86
  4. Step 4: Simplify right side
    1,389.12x = 2,611,706.49
  5. Step 5: Solve for x
    x = 2,611,706.49/1,389.12
  6. Step 6: Final answer
    x = 1,880.12

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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.