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Finding the Fourth Proportional to 28,471.14, 42,710.80 and 8,751.36

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Solution

The fourth proportional to 28,471.14, 42,710.80 and 8,751.36 is: 13,128.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,471.14 : 42,710.80 = 8,751.36 : x
  2. Step 2: Convert to fraction form
    28,471.14/42,710.80 = 8,751.36/x
  3. Step 3: Cross multiply
    28,471.14x = 42,710.80 × 8,751.36
  4. Step 4: Simplify right side
    28,471.14x = 373,777,351.26
  5. Step 5: Solve for x
    x = 373,777,351.26/28,471.14
  6. Step 6: Final answer
    x = 13,128.29

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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.