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Finding the Fourth Proportional to 28,900.80, 39,880.80 and 16,963.20

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Solution

The fourth proportional to 28,900.80, 39,880.80 and 16,963.20 is: 23,407.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,900.80 : 39,880.80 = 16,963.20 : x
  2. Step 2: Convert to fraction form
    28,900.80/39,880.80 = 16,963.20/x
  3. Step 3: Cross multiply
    28,900.80x = 39,880.80 × 16,963.20
  4. Step 4: Simplify right side
    28,900.80x = 676,505,986.56
  5. Step 5: Solve for x
    x = 676,505,986.56/28,900.80
  6. Step 6: Final answer
    x = 23,407.86

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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.