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Finding the Fourth Proportional to 18,972.60, 28,410.30 and 14,015.40

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Solution

The fourth proportional to 18,972.60, 28,410.30 and 14,015.40 is: 20,987.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,972.60 : 28,410.30 = 14,015.40 : x
  2. Step 2: Convert to fraction form
    18,972.60/28,410.30 = 14,015.40/x
  3. Step 3: Cross multiply
    18,972.60x = 28,410.30 × 14,015.40
  4. Step 4: Simplify right side
    18,972.60x = 398,181,718.62
  5. Step 5: Solve for x
    x = 398,181,718.62/18,972.60
  6. Step 6: Final answer
    x = 20,987.20

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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.