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Finding the Fourth Proportional to 28,605, 42,907.56 and 12,189

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Solution

The fourth proportional to 28,605, 42,907.56 and 12,189 is: 18,283.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,605 : 42,907.56 = 12,189 : x
  2. Step 2: Convert to fraction form
    28,605/42,907.56 = 12,189/x
  3. Step 3: Cross multiply
    28,605x = 42,907.56 × 12,189
  4. Step 4: Simplify right side
    28,605x = 523,000,248.84
  5. Step 5: Solve for x
    x = 523,000,248.84/28,605
  6. Step 6: Final answer
    x = 18,283.53

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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.