Home / 20,905.60-31,358.40-12,611.20

Finding the Fourth Proportional to 20,905.60, 31,358.40 and 12,611.20

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Solution

The fourth proportional to 20,905.60, 31,358.40 and 12,611.20 is: 18,916.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.60 : 31,358.40 = 12,611.20 : x
  2. Step 2: Convert to fraction form
    20,905.60/31,358.40 = 12,611.20/x
  3. Step 3: Cross multiply
    20,905.60x = 31,358.40 × 12,611.20
  4. Step 4: Simplify right side
    20,905.60x = 395,467,054.08
  5. Step 5: Solve for x
    x = 395,467,054.08/20,905.60
  6. Step 6: Final answer
    x = 18,916.80

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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.