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Finding the Fourth Proportional to 281,100.66, 421,650.99 and 81,421.11

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Solution

The fourth proportional to 281,100.66, 421,650.99 and 81,421.11 is: 122,131.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    281,100.66 : 421,650.99 = 81,421.11 : x
  2. Step 2: Convert to fraction form
    281,100.66/421,650.99 = 81,421.11/x
  3. Step 3: Cross multiply
    281,100.66x = 421,650.99 × 81,421.11
  4. Step 4: Simplify right side
    281,100.66x = 34,331,293,256.22
  5. Step 5: Solve for x
    x = 34,331,293,256.22/281,100.66
  6. Step 6: Final answer
    x = 122,131.67

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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.