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Finding the Fourth Proportional to 18,670.51, 28,005.74 and 8,669.79

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Solution

The fourth proportional to 18,670.51, 28,005.74 and 8,669.79 is: 13,004.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,670.51 : 28,005.74 = 8,669.79 : x
  2. Step 2: Convert to fraction form
    18,670.51/28,005.74 = 8,669.79/x
  3. Step 3: Cross multiply
    18,670.51x = 28,005.74 × 8,669.79
  4. Step 4: Simplify right side
    18,670.51x = 242,803,914.49
  5. Step 5: Solve for x
    x = 242,803,914.49/18,670.51
  6. Step 6: Final answer
    x = 13,004.67

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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.