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Finding the Fourth Proportional to 28,647, 42,972.93 and 7,870.50

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Solution

The fourth proportional to 28,647, 42,972.93 and 7,870.50 is: 11,806.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,647 : 42,972.93 = 7,870.50 : x
  2. Step 2: Convert to fraction form
    28,647/42,972.93 = 7,870.50/x
  3. Step 3: Cross multiply
    28,647x = 42,972.93 × 7,870.50
  4. Step 4: Simplify right side
    28,647x = 338,218,445.57
  5. Step 5: Solve for x
    x = 338,218,445.57/28,647
  6. Step 6: Final answer
    x = 11,806.42

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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.