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Finding the Fourth Proportional to 20,143.60, 30,215.40 and 18,102.40

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Solution

The fourth proportional to 20,143.60, 30,215.40 and 18,102.40 is: 27,153.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,143.60 : 30,215.40 = 18,102.40 : x
  2. Step 2: Convert to fraction form
    20,143.60/30,215.40 = 18,102.40/x
  3. Step 3: Cross multiply
    20,143.60x = 30,215.40 × 18,102.40
  4. Step 4: Simplify right side
    20,143.60x = 546,971,256.96
  5. Step 5: Solve for x
    x = 546,971,256.96/20,143.60
  6. Step 6: Final answer
    x = 27,153.60

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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.