Home / 20,905.12-31,362.96-9,221.60

Finding the Fourth Proportional to 20,905.12, 31,362.96 and 9,221.60

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Solution

The fourth proportional to 20,905.12, 31,362.96 and 9,221.60 is: 13,834.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.12 : 31,362.96 = 9,221.60 : x
  2. Step 2: Convert to fraction form
    20,905.12/31,362.96 = 9,221.60/x
  3. Step 3: Cross multiply
    20,905.12x = 31,362.96 × 9,221.60
  4. Step 4: Simplify right side
    20,905.12x = 289,216,671.94
  5. Step 5: Solve for x
    x = 289,216,671.94/20,905.12
  6. Step 6: Final answer
    x = 13,834.73

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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.