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Finding the Fourth Proportional to 28,280.80, 39,680.60 and 28,280.80

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Solution

The fourth proportional to 28,280.80, 39,680.60 and 28,280.80 is: 39,680.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,280.80 : 39,680.60 = 28,280.80 : x
  2. Step 2: Convert to fraction form
    28,280.80/39,680.60 = 28,280.80/x
  3. Step 3: Cross multiply
    28,280.80x = 39,680.60 × 28,280.80
  4. Step 4: Simplify right side
    28,280.80x = 1,122,199,112.48
  5. Step 5: Solve for x
    x = 1,122,199,112.48/28,280.80
  6. Step 6: Final answer
    x = 39,680.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.