Home / 1,391.14-1,915.40-1,180.90

Finding the Fourth Proportional to 1,391.14, 1,915.40 and 1,180.90

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Solution

The fourth proportional to 1,391.14, 1,915.40 and 1,180.90 is: 1,625.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.14 : 1,915.40 = 1,180.90 : x
  2. Step 2: Convert to fraction form
    1,391.14/1,915.40 = 1,180.90/x
  3. Step 3: Cross multiply
    1,391.14x = 1,915.40 × 1,180.90
  4. Step 4: Simplify right side
    1,391.14x = 2,261,880.38
  5. Step 5: Solve for x
    x = 2,261,880.38/1,391.14
  6. Step 6: Final answer
    x = 1,625.92

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Double scale
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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.