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Finding the Fourth Proportional to 99,991.60, 149,744.40 and 53,141.20

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Solution

The fourth proportional to 99,991.60, 149,744.40 and 53,141.20 is: 79,582.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    99,991.60 : 149,744.40 = 53,141.20 : x
  2. Step 2: Convert to fraction form
    99,991.60/149,744.40 = 53,141.20/x
  3. Step 3: Cross multiply
    99,991.60x = 149,744.40 × 53,141.20
  4. Step 4: Simplify right side
    99,991.60x = 7,957,597,109.28
  5. Step 5: Solve for x
    x = 7,957,597,109.28/99,991.60
  6. Step 6: Final answer
    x = 79,582.66

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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.