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Finding the Fourth Proportional to 109,128.80, 163,462.80 and 90,696.80

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Solution

The fourth proportional to 109,128.80, 163,462.80 and 90,696.80 is: 135,853.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    109,128.80 : 163,462.80 = 90,696.80 : x
  2. Step 2: Convert to fraction form
    109,128.80/163,462.80 = 90,696.80/x
  3. Step 3: Cross multiply
    109,128.80x = 163,462.80 × 90,696.80
  4. Step 4: Simplify right side
    109,128.80x = 14,825,552,879.04
  5. Step 5: Solve for x
    x = 14,825,552,879.04/109,128.80
  6. Step 6: Final answer
    x = 135,853.71

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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.