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Finding the Fourth Proportional to 117,262.08, 161,838 and 87,139.80

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Solution

The fourth proportional to 117,262.08, 161,838 and 87,139.80 is: 120,265.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    117,262.08 : 161,838 = 87,139.80 : x
  2. Step 2: Convert to fraction form
    117,262.08/161,838 = 87,139.80/x
  3. Step 3: Cross multiply
    117,262.08x = 161,838 × 87,139.80
  4. Step 4: Simplify right side
    117,262.08x = 14,102,530,952.40
  5. Step 5: Solve for x
    x = 14,102,530,952.40/117,262.08
  6. Step 6: Final answer
    x = 120,265.06

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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.