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Finding the Fourth Proportional to 8,957.55, 12,361.44 and 4,978.56

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Solution

The fourth proportional to 8,957.55, 12,361.44 and 4,978.56 is: 6,870.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,957.55 : 12,361.44 = 4,978.56 : x
  2. Step 2: Convert to fraction form
    8,957.55/12,361.44 = 4,978.56/x
  3. Step 3: Cross multiply
    8,957.55x = 12,361.44 × 4,978.56
  4. Step 4: Simplify right side
    8,957.55x = 61,542,170.73
  5. Step 5: Solve for x
    x = 61,542,170.73/8,957.55
  6. Step 6: Final answer
    x = 6,870.42

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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.