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Finding the Fourth Proportional to 18,659.40, 28,004.40 and 18,513.60

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Solution

The fourth proportional to 18,659.40, 28,004.40 and 18,513.60 is: 27,785.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.40 : 28,004.40 = 18,513.60 : x
  2. Step 2: Convert to fraction form
    18,659.40/28,004.40 = 18,513.60/x
  3. Step 3: Cross multiply
    18,659.40x = 28,004.40 × 18,513.60
  4. Step 4: Simplify right side
    18,659.40x = 518,462,259.84
  5. Step 5: Solve for x
    x = 518,462,259.84/18,659.40
  6. Step 6: Final answer
    x = 27,785.58

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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.