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Finding the Fourth Proportional to 214,190.40, 321,055.20 and 81,019.20

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Solution

The fourth proportional to 214,190.40, 321,055.20 and 81,019.20 is: 121,441.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    214,190.40 : 321,055.20 = 81,019.20 : x
  2. Step 2: Convert to fraction form
    214,190.40/321,055.20 = 81,019.20/x
  3. Step 3: Cross multiply
    214,190.40x = 321,055.20 × 81,019.20
  4. Step 4: Simplify right side
    214,190.40x = 26,011,635,459.84
  5. Step 5: Solve for x
    x = 26,011,635,459.84/214,190.40
  6. Step 6: Final answer
    x = 121,441.65

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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.