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Finding the Fourth Proportional to 212,611.22, 318,928.47 and 86,232.69

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Solution

The fourth proportional to 212,611.22, 318,928.47 and 86,232.69 is: 129,353.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,611.22 : 318,928.47 = 86,232.69 : x
  2. Step 2: Convert to fraction form
    212,611.22/318,928.47 = 86,232.69/x
  3. Step 3: Cross multiply
    212,611.22x = 318,928.47 × 86,232.69
  4. Step 4: Simplify right side
    212,611.22x = 27,502,059,885.68
  5. Step 5: Solve for x
    x = 27,502,059,885.68/212,611.22
  6. Step 6: Final answer
    x = 129,353.76

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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.