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Finding the Fourth Proportional to 18,909.76, 28,370.60 and 8,914.10

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Solution

The fourth proportional to 18,909.76, 28,370.60 and 8,914.10 is: 13,373.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.76 : 28,370.60 = 8,914.10 : x
  2. Step 2: Convert to fraction form
    18,909.76/28,370.60 = 8,914.10/x
  3. Step 3: Cross multiply
    18,909.76x = 28,370.60 × 8,914.10
  4. Step 4: Simplify right side
    18,909.76x = 252,898,365.46
  5. Step 5: Solve for x
    x = 252,898,365.46/18,909.76
  6. Step 6: Final answer
    x = 13,373.96

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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.