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Finding the Fourth Proportional to 20,489.60, 30,734.40 and 12,713.60

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Solution

The fourth proportional to 20,489.60, 30,734.40 and 12,713.60 is: 19,070.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489.60 : 30,734.40 = 12,713.60 : x
  2. Step 2: Convert to fraction form
    20,489.60/30,734.40 = 12,713.60/x
  3. Step 3: Cross multiply
    20,489.60x = 30,734.40 × 12,713.60
  4. Step 4: Simplify right side
    20,489.60x = 390,744,867.84
  5. Step 5: Solve for x
    x = 390,744,867.84/20,489.60
  6. Step 6: Final answer
    x = 19,070.40

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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.