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Finding the Fourth Proportional to 3,212.88, 4,820.34 and 1,978.58

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Solution

The fourth proportional to 3,212.88, 4,820.34 and 1,978.58 is: 2,968.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,212.88 : 4,820.34 = 1,978.58 : x
  2. Step 2: Convert to fraction form
    3,212.88/4,820.34 = 1,978.58/x
  3. Step 3: Cross multiply
    3,212.88x = 4,820.34 × 1,978.58
  4. Step 4: Simplify right side
    3,212.88x = 9,537,404.22
  5. Step 5: Solve for x
    x = 9,537,404.22/3,212.88
  6. Step 6: Final answer
    x = 2,968.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.