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Finding the Fourth Proportional to 72,178.43, 99,605.55 and 39,914.46

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Solution

The fourth proportional to 72,178.43, 99,605.55 and 39,914.46 is: 55,081.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,178.43 : 99,605.55 = 39,914.46 : x
  2. Step 2: Convert to fraction form
    72,178.43/99,605.55 = 39,914.46/x
  3. Step 3: Cross multiply
    72,178.43x = 99,605.55 × 39,914.46
  4. Step 4: Simplify right side
    72,178.43x = 3,975,701,526.34
  5. Step 5: Solve for x
    x = 3,975,701,526.34/72,178.43
  6. Step 6: Final answer
    x = 55,081.57

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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.