Home / 20,121.60-30,182.40-12,637.20

Finding the Fourth Proportional to 20,121.60, 30,182.40 and 12,637.20

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Solution

The fourth proportional to 20,121.60, 30,182.40 and 12,637.20 is: 18,955.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,121.60 : 30,182.40 = 12,637.20 : x
  2. Step 2: Convert to fraction form
    20,121.60/30,182.40 = 12,637.20/x
  3. Step 3: Cross multiply
    20,121.60x = 30,182.40 × 12,637.20
  4. Step 4: Simplify right side
    20,121.60x = 381,421,025.28
  5. Step 5: Solve for x
    x = 381,421,025.28/20,121.60
  6. Step 6: Final answer
    x = 18,955.80

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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.