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Finding the Fourth Proportional to 20,400.93, 30,588.93 and 18,660.60

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Solution

The fourth proportional to 20,400.93, 30,588.93 and 18,660.60 is: 27,979.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,400.93 : 30,588.93 = 18,660.60 : x
  2. Step 2: Convert to fraction form
    20,400.93/30,588.93 = 18,660.60/x
  3. Step 3: Cross multiply
    20,400.93x = 30,588.93 × 18,660.60
  4. Step 4: Simplify right side
    20,400.93x = 570,807,787.16
  5. Step 5: Solve for x
    x = 570,807,787.16/20,400.93
  6. Step 6: Final answer
    x = 27,979.50

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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.