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Finding the Fourth Proportional to 20,312.60, 30,486.90 and 11,982.20

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Solution

The fourth proportional to 20,312.60, 30,486.90 and 11,982.20 is: 17,983.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,312.60 : 30,486.90 = 11,982.20 : x
  2. Step 2: Convert to fraction form
    20,312.60/30,486.90 = 11,982.20/x
  3. Step 3: Cross multiply
    20,312.60x = 30,486.90 × 11,982.20
  4. Step 4: Simplify right side
    20,312.60x = 365,300,133.18
  5. Step 5: Solve for x
    x = 365,300,133.18/20,312.60
  6. Step 6: Final answer
    x = 17,983.92

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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.