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Finding the Fourth Proportional to 28,756.84, 43,138.88 and 7,980.36

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Solution

The fourth proportional to 28,756.84, 43,138.88 and 7,980.36 is: 11,971.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,756.84 : 43,138.88 = 7,980.36 : x
  2. Step 2: Convert to fraction form
    28,756.84/43,138.88 = 7,980.36/x
  3. Step 3: Cross multiply
    28,756.84x = 43,138.88 × 7,980.36
  4. Step 4: Simplify right side
    28,756.84x = 344,263,792.40
  5. Step 5: Solve for x
    x = 344,263,792.40/28,756.84
  6. Step 6: Final answer
    x = 11,971.54

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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.