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Finding the Fourth Proportional to 216,879, 299,299.80 and 121,385.52

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Solution

The fourth proportional to 216,879, 299,299.80 and 121,385.52 is: 167,515.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    216,879 : 299,299.80 = 121,385.52 : x
  2. Step 2: Convert to fraction form
    216,879/299,299.80 = 121,385.52/x
  3. Step 3: Cross multiply
    216,879x = 299,299.80 × 121,385.52
  4. Step 4: Simplify right side
    216,879x = 36,330,661,858.90
  5. Step 5: Solve for x
    x = 36,330,661,858.90/216,879
  6. Step 6: Final answer
    x = 167,515.81

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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.