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Finding the Fourth Proportional to 18,711.60, 28,099.80 and 18,128.40

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Solution

The fourth proportional to 18,711.60, 28,099.80 and 18,128.40 is: 27,223.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,711.60 : 28,099.80 = 18,128.40 : x
  2. Step 2: Convert to fraction form
    18,711.60/28,099.80 = 18,128.40/x
  3. Step 3: Cross multiply
    18,711.60x = 28,099.80 × 18,128.40
  4. Step 4: Simplify right side
    18,711.60x = 509,404,414.32
  5. Step 5: Solve for x
    x = 509,404,414.32/18,711.60
  6. Step 6: Final answer
    x = 27,223.99

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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.