Home / 20,905.30-28,774.20-18,911.62

Finding the Fourth Proportional to 20,905.30, 28,774.20 and 18,911.62

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Solution

The fourth proportional to 20,905.30, 28,774.20 and 18,911.62 is: 26,030.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.30 : 28,774.20 = 18,911.62 : x
  2. Step 2: Convert to fraction form
    20,905.30/28,774.20 = 18,911.62/x
  3. Step 3: Cross multiply
    20,905.30x = 28,774.20 × 18,911.62
  4. Step 4: Simplify right side
    20,905.30x = 544,166,736.20
  5. Step 5: Solve for x
    x = 544,166,736.20/20,905.30
  6. Step 6: Final answer
    x = 26,030.09

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.