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Finding the Fourth Proportional to 28,967.72, 39,976.02 and 18,902.60

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Solution

The fourth proportional to 28,967.72, 39,976.02 and 18,902.60 is: 26,085.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,967.72 : 39,976.02 = 18,902.60 : x
  2. Step 2: Convert to fraction form
    28,967.72/39,976.02 = 18,902.60/x
  3. Step 3: Cross multiply
    28,967.72x = 39,976.02 × 18,902.60
  4. Step 4: Simplify right side
    28,967.72x = 755,650,715.65
  5. Step 5: Solve for x
    x = 755,650,715.65/28,967.72
  6. Step 6: Final answer
    x = 26,085.96

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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.