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Finding the Fourth Proportional to 20,459.60, 30,689.40 and 12,672.80

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Solution

The fourth proportional to 20,459.60, 30,689.40 and 12,672.80 is: 19,009.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,459.60 : 30,689.40 = 12,672.80 : x
  2. Step 2: Convert to fraction form
    20,459.60/30,689.40 = 12,672.80/x
  3. Step 3: Cross multiply
    20,459.60x = 30,689.40 × 12,672.80
  4. Step 4: Simplify right side
    20,459.60x = 388,920,628.32
  5. Step 5: Solve for x
    x = 388,920,628.32/20,459.60
  6. Step 6: Final answer
    x = 19,009.20

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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.