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Finding the Fourth Proportional to 18,690.40, 28,078.80 and 12,858.40

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Solution

The fourth proportional to 18,690.40, 28,078.80 and 12,858.40 is: 19,317.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,690.40 : 28,078.80 = 12,858.40 : x
  2. Step 2: Convert to fraction form
    18,690.40/28,078.80 = 12,858.40/x
  3. Step 3: Cross multiply
    18,690.40x = 28,078.80 × 12,858.40
  4. Step 4: Simplify right side
    18,690.40x = 361,048,441.92
  5. Step 5: Solve for x
    x = 361,048,441.92/18,690.40
  6. Step 6: Final answer
    x = 19,317.32

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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.