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Finding the Fourth Proportional to 3,280.80, 4,915.80 and 3,086.40

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Solution

The fourth proportional to 3,280.80, 4,915.80 and 3,086.40 is: 4,624.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,280.80 : 4,915.80 = 3,086.40 : x
  2. Step 2: Convert to fraction form
    3,280.80/4,915.80 = 3,086.40/x
  3. Step 3: Cross multiply
    3,280.80x = 4,915.80 × 3,086.40
  4. Step 4: Simplify right side
    3,280.80x = 15,172,125.12
  5. Step 5: Solve for x
    x = 15,172,125.12/3,280.80
  6. Step 6: Final answer
    x = 4,624.52

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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.