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Finding the Fourth Proportional to 20,219.60, 30,329.40 and 15,991.40

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Solution

The fourth proportional to 20,219.60, 30,329.40 and 15,991.40 is: 23,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,219.60 : 30,329.40 = 15,991.40 : x
  2. Step 2: Convert to fraction form
    20,219.60/30,329.40 = 15,991.40/x
  3. Step 3: Cross multiply
    20,219.60x = 30,329.40 × 15,991.40
  4. Step 4: Simplify right side
    20,219.60x = 485,009,567.16
  5. Step 5: Solve for x
    x = 485,009,567.16/20,219.60
  6. Step 6: Final answer
    x = 23,987.10

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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.