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Finding the Fourth Proportional to 84,636.60, 126,954.90 and 21,456.60

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Solution

The fourth proportional to 84,636.60, 126,954.90 and 21,456.60 is: 32,184.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,636.60 : 126,954.90 = 21,456.60 : x
  2. Step 2: Convert to fraction form
    84,636.60/126,954.90 = 21,456.60/x
  3. Step 3: Cross multiply
    84,636.60x = 126,954.90 × 21,456.60
  4. Step 4: Simplify right side
    84,636.60x = 2,724,020,507.34
  5. Step 5: Solve for x
    x = 2,724,020,507.34/84,636.60
  6. Step 6: Final answer
    x = 32,184.90

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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.