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Finding the Fourth Proportional to 19,989.60, 29,965.20 and 15,544.80

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Solution

The fourth proportional to 19,989.60, 29,965.20 and 15,544.80 is: 23,302.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989.60 : 29,965.20 = 15,544.80 : x
  2. Step 2: Convert to fraction form
    19,989.60/29,965.20 = 15,544.80/x
  3. Step 3: Cross multiply
    19,989.60x = 29,965.20 × 15,544.80
  4. Step 4: Simplify right side
    19,989.60x = 465,803,040.96
  5. Step 5: Solve for x
    x = 465,803,040.96/19,989.60
  6. Step 6: Final answer
    x = 23,302.27

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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.