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Finding the Fourth Proportional to 20,021.80, 29,879.09 and 15,615.40

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Solution

The fourth proportional to 20,021.80, 29,879.09 and 15,615.40 is: 23,303.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,021.80 : 29,879.09 = 15,615.40 : x
  2. Step 2: Convert to fraction form
    20,021.80/29,879.09 = 15,615.40/x
  3. Step 3: Cross multiply
    20,021.80x = 29,879.09 × 15,615.40
  4. Step 4: Simplify right side
    20,021.80x = 466,573,941.99
  5. Step 5: Solve for x
    x = 466,573,941.99/20,021.80
  6. Step 6: Final answer
    x = 23,303.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.