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Finding the Fourth Proportional to 2,840.80, 3,915.12 and 2,800.48

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Solution

The fourth proportional to 2,840.80, 3,915.12 and 2,800.48 is: 3,859.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,840.80 : 3,915.12 = 2,800.48 : x
  2. Step 2: Convert to fraction form
    2,840.80/3,915.12 = 2,800.48/x
  3. Step 3: Cross multiply
    2,840.80x = 3,915.12 × 2,800.48
  4. Step 4: Simplify right side
    2,840.80x = 10,964,215.26
  5. Step 5: Solve for x
    x = 10,964,215.26/2,840.80
  6. Step 6: Final answer
    x = 3,859.55

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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.