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Finding the Fourth Proportional to 139,071.33, 191,918.79 and 75,409.11

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Solution

The fourth proportional to 139,071.33, 191,918.79 and 75,409.11 is: 104,064.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,071.33 : 191,918.79 = 75,409.11 : x
  2. Step 2: Convert to fraction form
    139,071.33/191,918.79 = 75,409.11/x
  3. Step 3: Cross multiply
    139,071.33x = 191,918.79 × 75,409.11
  4. Step 4: Simplify right side
    139,071.33x = 14,472,425,146.18
  5. Step 5: Solve for x
    x = 14,472,425,146.18/139,071.33
  6. Step 6: Final answer
    x = 104,064.76

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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.