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Finding the Fourth Proportional to 28,751.69, 39,678.22 and 15,655.55

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Solution

The fourth proportional to 28,751.69, 39,678.22 and 15,655.55 is: 21,605.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,751.69 : 39,678.22 = 15,655.55 : x
  2. Step 2: Convert to fraction form
    28,751.69/39,678.22 = 15,655.55/x
  3. Step 3: Cross multiply
    28,751.69x = 39,678.22 × 15,655.55
  4. Step 4: Simplify right side
    28,751.69x = 621,184,469.05
  5. Step 5: Solve for x
    x = 621,184,469.05/28,751.69
  6. Step 6: Final answer
    x = 21,605.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.