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Finding the Fourth Proportional to 13,668.65, 18,873.92 and 8,640.98

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Solution

The fourth proportional to 13,668.65, 18,873.92 and 8,640.98 is: 11,931.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,668.65 : 18,873.92 = 8,640.98 : x
  2. Step 2: Convert to fraction form
    13,668.65/18,873.92 = 8,640.98/x
  3. Step 3: Cross multiply
    13,668.65x = 18,873.92 × 8,640.98
  4. Step 4: Simplify right side
    13,668.65x = 163,089,122.04
  5. Step 5: Solve for x
    x = 163,089,122.04/13,668.65
  6. Step 6: Final answer
    x = 11,931.62

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1.5x scale

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.