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Finding the Fourth Proportional to 20,659.80, 30,989.70 and 18,586.20

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Solution

The fourth proportional to 20,659.80, 30,989.70 and 18,586.20 is: 27,879.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,659.80 : 30,989.70 = 18,586.20 : x
  2. Step 2: Convert to fraction form
    20,659.80/30,989.70 = 18,586.20/x
  3. Step 3: Cross multiply
    20,659.80x = 30,989.70 × 18,586.20
  4. Step 4: Simplify right side
    20,659.80x = 575,980,762.14
  5. Step 5: Solve for x
    x = 575,980,762.14/20,659.80
  6. Step 6: Final answer
    x = 27,879.30

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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.