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Finding the Fourth Proportional to 18,720.56, 28,064.28 and 7,636.52

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Solution

The fourth proportional to 18,720.56, 28,064.28 and 7,636.52 is: 11,448.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.56 : 28,064.28 = 7,636.52 : x
  2. Step 2: Convert to fraction form
    18,720.56/28,064.28 = 7,636.52/x
  3. Step 3: Cross multiply
    18,720.56x = 28,064.28 × 7,636.52
  4. Step 4: Simplify right side
    18,720.56x = 214,313,435.51
  5. Step 5: Solve for x
    x = 214,313,435.51/18,720.56
  6. Step 6: Final answer
    x = 11,448.02

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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.