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Finding the Fourth Proportional to 19,958.80, 29,938.20 and 18,986.80

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Solution

The fourth proportional to 19,958.80, 29,938.20 and 18,986.80 is: 28,480.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,958.80 : 29,938.20 = 18,986.80 : x
  2. Step 2: Convert to fraction form
    19,958.80/29,938.20 = 18,986.80/x
  3. Step 3: Cross multiply
    19,958.80x = 29,938.20 × 18,986.80
  4. Step 4: Simplify right side
    19,958.80x = 568,430,615.76
  5. Step 5: Solve for x
    x = 568,430,615.76/19,958.80
  6. Step 6: Final answer
    x = 28,480.20

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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.