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Finding the Fourth Proportional to 18,712.50, 28,070.37 and 4,861.50

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Solution

The fourth proportional to 18,712.50, 28,070.37 and 4,861.50 is: 7,292.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,712.50 : 28,070.37 = 4,861.50 : x
  2. Step 2: Convert to fraction form
    18,712.50/28,070.37 = 4,861.50/x
  3. Step 3: Cross multiply
    18,712.50x = 28,070.37 × 4,861.50
  4. Step 4: Simplify right side
    18,712.50x = 136,464,103.76
  5. Step 5: Solve for x
    x = 136,464,103.76/18,712.50
  6. Step 6: Final answer
    x = 7,292.67

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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.