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Finding the Fourth Proportional to 28,749, 43,123.50 and 7,972.50

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Solution

The fourth proportional to 28,749, 43,123.50 and 7,972.50 is: 11,958.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,749 : 43,123.50 = 7,972.50 : x
  2. Step 2: Convert to fraction form
    28,749/43,123.50 = 7,972.50/x
  3. Step 3: Cross multiply
    28,749x = 43,123.50 × 7,972.50
  4. Step 4: Simplify right side
    28,749x = 343,802,103.75
  5. Step 5: Solve for x
    x = 343,802,103.75/28,749
  6. Step 6: Final answer
    x = 11,958.75

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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.