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Finding the Fourth Proportional to 239,511.94, 330,489.21 and 138,890.50

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Solution

The fourth proportional to 239,511.94, 330,489.21 and 138,890.50 is: 191,647.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    239,511.94 : 330,489.21 = 138,890.50 : x
  2. Step 2: Convert to fraction form
    239,511.94/330,489.21 = 138,890.50/x
  3. Step 3: Cross multiply
    239,511.94x = 330,489.21 × 138,890.50
  4. Step 4: Simplify right side
    239,511.94x = 45,901,811,621.51
  5. Step 5: Solve for x
    x = 45,901,811,621.51/239,511.94
  6. Step 6: Final answer
    x = 191,647.28

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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.