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Finding the Fourth Proportional to 216,755.42, 325,226.54 and 90,420.54

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Solution

The fourth proportional to 216,755.42, 325,226.54 and 90,420.54 is: 135,669.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,755.42 : 325,226.54 = 90,420.54 : x
  2. Step 2: Convert to fraction form
    216,755.42/325,226.54 = 90,420.54/x
  3. Step 3: Cross multiply
    216,755.42x = 325,226.54 × 90,420.54
  4. Step 4: Simplify right side
    216,755.42x = 29,407,159,369.13
  5. Step 5: Solve for x
    x = 29,407,159,369.13/216,755.42
  6. Step 6: Final answer
    x = 135,669.78

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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.