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Finding the Fourth Proportional to 15,921.20, 23,907.30 and 12,661.40

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Solution

The fourth proportional to 15,921.20, 23,907.30 and 12,661.40 is: 19,012.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,921.20 : 23,907.30 = 12,661.40 : x
  2. Step 2: Convert to fraction form
    15,921.20/23,907.30 = 12,661.40/x
  3. Step 3: Cross multiply
    15,921.20x = 23,907.30 × 12,661.40
  4. Step 4: Simplify right side
    15,921.20x = 302,699,888.22
  5. Step 5: Solve for x
    x = 302,699,888.22/15,921.20
  6. Step 6: Final answer
    x = 19,012.38

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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.