Home / 3,915.80-5,403.76-2,147.40

Finding the Fourth Proportional to 3,915.80, 5,403.76 and 2,147.40

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Solution

The fourth proportional to 3,915.80, 5,403.76 and 2,147.40 is: 2,963.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,915.80 : 5,403.76 = 2,147.40 : x
  2. Step 2: Convert to fraction form
    3,915.80/5,403.76 = 2,147.40/x
  3. Step 3: Cross multiply
    3,915.80x = 5,403.76 × 2,147.40
  4. Step 4: Simplify right side
    3,915.80x = 11,604,034.22
  5. Step 5: Solve for x
    x = 11,604,034.22/3,915.80
  6. Step 6: Final answer
    x = 2,963.39

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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.