Home / 8,428.80-12,653.60-5,308.80

Finding the Fourth Proportional to 8,428.80, 12,653.60 and 5,308.80

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Solution

The fourth proportional to 8,428.80, 12,653.60 and 5,308.80 is: 7,969.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,428.80 : 12,653.60 = 5,308.80 : x
  2. Step 2: Convert to fraction form
    8,428.80/12,653.60 = 5,308.80/x
  3. Step 3: Cross multiply
    8,428.80x = 12,653.60 × 5,308.80
  4. Step 4: Simplify right side
    8,428.80x = 67,175,431.68
  5. Step 5: Solve for x
    x = 67,175,431.68/8,428.80
  6. Step 6: Final answer
    x = 7,969.75

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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.