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Finding the Fourth Proportional to 20,123.90, 30,189.90 and 16,859.60

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Solution

The fourth proportional to 20,123.90, 30,189.90 and 16,859.60 is: 25,292.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,123.90 : 30,189.90 = 16,859.60 : x
  2. Step 2: Convert to fraction form
    20,123.90/30,189.90 = 16,859.60/x
  3. Step 3: Cross multiply
    20,123.90x = 30,189.90 × 16,859.60
  4. Step 4: Simplify right side
    20,123.90x = 508,989,638.04
  5. Step 5: Solve for x
    x = 508,989,638.04/20,123.90
  6. Step 6: Final answer
    x = 25,292.79

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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.