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Finding the Fourth Proportional to 30,638.88, 45,986.40 and 15,856.80

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Solution

The fourth proportional to 30,638.88, 45,986.40 and 15,856.80 is: 23,799.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,638.88 : 45,986.40 = 15,856.80 : x
  2. Step 2: Convert to fraction form
    30,638.88/45,986.40 = 15,856.80/x
  3. Step 3: Cross multiply
    30,638.88x = 45,986.40 × 15,856.80
  4. Step 4: Simplify right side
    30,638.88x = 729,197,147.52
  5. Step 5: Solve for x
    x = 729,197,147.52/30,638.88
  6. Step 6: Final answer
    x = 23,799.73

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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.