Home / 20,901.60-31,352.40-12,607.20

Finding the Fourth Proportional to 20,901.60, 31,352.40 and 12,607.20

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Solution

The fourth proportional to 20,901.60, 31,352.40 and 12,607.20 is: 18,910.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,901.60 : 31,352.40 = 12,607.20 : x
  2. Step 2: Convert to fraction form
    20,901.60/31,352.40 = 12,607.20/x
  3. Step 3: Cross multiply
    20,901.60x = 31,352.40 × 12,607.20
  4. Step 4: Simplify right side
    20,901.60x = 395,265,977.28
  5. Step 5: Solve for x
    x = 395,265,977.28/20,901.60
  6. Step 6: Final answer
    x = 18,910.80

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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.