Home / 20,185.60-30,278.40-12,398.80

Finding the Fourth Proportional to 20,185.60, 30,278.40 and 12,398.80

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Solution

The fourth proportional to 20,185.60, 30,278.40 and 12,398.80 is: 18,598.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,185.60 : 30,278.40 = 12,398.80 : x
  2. Step 2: Convert to fraction form
    20,185.60/30,278.40 = 12,398.80/x
  3. Step 3: Cross multiply
    20,185.60x = 30,278.40 × 12,398.80
  4. Step 4: Simplify right side
    20,185.60x = 375,415,825.92
  5. Step 5: Solve for x
    x = 375,415,825.92/20,185.60
  6. Step 6: Final answer
    x = 18,598.20

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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.