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Finding the Fourth Proportional to 28,391.40, 42,586.92 and 8,669.88

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Solution

The fourth proportional to 28,391.40, 42,586.92 and 8,669.88 is: 13,004.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,391.40 : 42,586.92 = 8,669.88 : x
  2. Step 2: Convert to fraction form
    28,391.40/42,586.92 = 8,669.88/x
  3. Step 3: Cross multiply
    28,391.40x = 42,586.92 × 8,669.88
  4. Step 4: Simplify right side
    28,391.40x = 369,223,485.97
  5. Step 5: Solve for x
    x = 369,223,485.97/28,391.40
  6. Step 6: Final answer
    x = 13,004.77

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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.