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Finding the Fourth Proportional to 28,204.54, 42,315.12 and 8,486.11

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Solution

The fourth proportional to 28,204.54, 42,315.12 and 8,486.11 is: 12,731.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,204.54 : 42,315.12 = 8,486.11 : x
  2. Step 2: Convert to fraction form
    28,204.54/42,315.12 = 8,486.11/x
  3. Step 3: Cross multiply
    28,204.54x = 42,315.12 × 8,486.11
  4. Step 4: Simplify right side
    28,204.54x = 359,090,762.98
  5. Step 5: Solve for x
    x = 359,090,762.98/28,204.54
  6. Step 6: Final answer
    x = 12,731.67

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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.