Home / 12,628.64-18,928.56-7,687.40

Finding the Fourth Proportional to 12,628.64, 18,928.56 and 7,687.40

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Solution

The fourth proportional to 12,628.64, 18,928.56 and 7,687.40 is: 11,522.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,628.64 : 18,928.56 = 7,687.40 : x
  2. Step 2: Convert to fraction form
    12,628.64/18,928.56 = 7,687.40/x
  3. Step 3: Cross multiply
    12,628.64x = 18,928.56 × 7,687.40
  4. Step 4: Simplify right side
    12,628.64x = 145,511,412.14
  5. Step 5: Solve for x
    x = 145,511,412.14/12,628.64
  6. Step 6: Final answer
    x = 11,522.33

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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.