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Finding the Fourth Proportional to 18,790.84, 28,189.86 and 8,402.50

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Solution

The fourth proportional to 18,790.84, 28,189.86 and 8,402.50 is: 12,605.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,790.84 : 28,189.86 = 8,402.50 : x
  2. Step 2: Convert to fraction form
    18,790.84/28,189.86 = 8,402.50/x
  3. Step 3: Cross multiply
    18,790.84x = 28,189.86 × 8,402.50
  4. Step 4: Simplify right side
    18,790.84x = 236,865,298.65
  5. Step 5: Solve for x
    x = 236,865,298.65/18,790.84
  6. Step 6: Final answer
    x = 12,605.36

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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.