Home / 18,921.30-28,385.40-6,440.73

Finding the Fourth Proportional to 18,921.30, 28,385.40 and 6,440.73

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Solution

The fourth proportional to 18,921.30, 28,385.40 and 6,440.73 is: 9,662.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,921.30 : 28,385.40 = 6,440.73 : x
  2. Step 2: Convert to fraction form
    18,921.30/28,385.40 = 6,440.73/x
  3. Step 3: Cross multiply
    18,921.30x = 28,385.40 × 6,440.73
  4. Step 4: Simplify right side
    18,921.30x = 182,822,697.34
  5. Step 5: Solve for x
    x = 182,822,697.34/18,921.30
  6. Step 6: Final answer
    x = 9,662.27

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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.