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Finding the Fourth Proportional to 28,756.50, 43,137.18 and 7,980

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Solution

The fourth proportional to 28,756.50, 43,137.18 and 7,980 is: 11,970.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,756.50 : 43,137.18 = 7,980 : x
  2. Step 2: Convert to fraction form
    28,756.50/43,137.18 = 7,980/x
  3. Step 3: Cross multiply
    28,756.50x = 43,137.18 × 7,980
  4. Step 4: Simplify right side
    28,756.50x = 344,234,696.40
  5. Step 5: Solve for x
    x = 344,234,696.40/28,756.50
  6. Step 6: Final answer
    x = 11,970.67

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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.