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Finding the Fourth Proportional to 2,915.78, 4,393.13 and 2,638.49

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Solution

The fourth proportional to 2,915.78, 4,393.13 and 2,638.49 is: 3,975.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,915.78 : 4,393.13 = 2,638.49 : x
  2. Step 2: Convert to fraction form
    2,915.78/4,393.13 = 2,638.49/x
  3. Step 3: Cross multiply
    2,915.78x = 4,393.13 × 2,638.49
  4. Step 4: Simplify right side
    2,915.78x = 11,591,194.42
  5. Step 5: Solve for x
    x = 11,591,194.42/2,915.78
  6. Step 6: Final answer
    x = 3,975.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.