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Finding the Fourth Proportional to 221,891.25, 306,209.93 and 121,289.25

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Solution

The fourth proportional to 221,891.25, 306,209.93 and 121,289.25 is: 167,379.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,891.25 : 306,209.93 = 121,289.25 : x
  2. Step 2: Convert to fraction form
    221,891.25/306,209.93 = 121,289.25/x
  3. Step 3: Cross multiply
    221,891.25x = 306,209.93 × 121,289.25
  4. Step 4: Simplify right side
    221,891.25x = 37,139,972,145.81
  5. Step 5: Solve for x
    x = 37,139,972,145.81/221,891.25
  6. Step 6: Final answer
    x = 167,379.17

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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.