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Finding the Fourth Proportional to 72,489.89, 99,991.82 and 47,960.66

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Solution

The fourth proportional to 72,489.89, 99,991.82 and 47,960.66 is: 66,156.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,489.89 : 99,991.82 = 47,960.66 : x
  2. Step 2: Convert to fraction form
    72,489.89/99,991.82 = 47,960.66/x
  3. Step 3: Cross multiply
    72,489.89x = 99,991.82 × 47,960.66
  4. Step 4: Simplify right side
    72,489.89x = 4,795,674,051.68
  5. Step 5: Solve for x
    x = 4,795,674,051.68/72,489.89
  6. Step 6: Final answer
    x = 66,156.45

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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.