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Finding the Fourth Proportional to 119,885.05, 165,339.79 and 72,129.48

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Solution

The fourth proportional to 119,885.05, 165,339.79 and 72,129.48 is: 99,477.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    119,885.05 : 165,339.79 = 72,129.48 : x
  2. Step 2: Convert to fraction form
    119,885.05/165,339.79 = 72,129.48/x
  3. Step 3: Cross multiply
    119,885.05x = 165,339.79 × 72,129.48
  4. Step 4: Simplify right side
    119,885.05x = 11,925,873,076.01
  5. Step 5: Solve for x
    x = 11,925,873,076.01/119,885.05
  6. Step 6: Final answer
    x = 99,477.57

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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.