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Finding the Fourth Proportional to 18,911.58, 28,373.76 and 8,380.16

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Solution

The fourth proportional to 18,911.58, 28,373.76 and 8,380.16 is: 12,573.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,911.58 : 28,373.76 = 8,380.16 : x
  2. Step 2: Convert to fraction form
    18,911.58/28,373.76 = 8,380.16/x
  3. Step 3: Cross multiply
    18,911.58x = 28,373.76 × 8,380.16
  4. Step 4: Simplify right side
    18,911.58x = 237,776,648.60
  5. Step 5: Solve for x
    x = 237,776,648.60/18,911.58
  6. Step 6: Final answer
    x = 12,573.07

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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.