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Finding the Fourth Proportional to 215,929.40, 324,039.90 and 121,159.40

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Solution

The fourth proportional to 215,929.40, 324,039.90 and 121,159.40 is: 181,820.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,929.40 : 324,039.90 = 121,159.40 : x
  2. Step 2: Convert to fraction form
    215,929.40/324,039.90 = 121,159.40/x
  3. Step 3: Cross multiply
    215,929.40x = 324,039.90 × 121,159.40
  4. Step 4: Simplify right side
    215,929.40x = 39,260,479,860.06
  5. Step 5: Solve for x
    x = 39,260,479,860.06/215,929.40
  6. Step 6: Final answer
    x = 181,820.91

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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.