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Finding the Fourth Proportional to 279,438.68, 384,771.40 and 210,628.12

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Solution

The fourth proportional to 279,438.68, 384,771.40 and 210,628.12 is: 290,023.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,438.68 : 384,771.40 = 210,628.12 : x
  2. Step 2: Convert to fraction form
    279,438.68/384,771.40 = 210,628.12/x
  3. Step 3: Cross multiply
    279,438.68x = 384,771.40 × 210,628.12
  4. Step 4: Simplify right side
    279,438.68x = 81,043,676,611.77
  5. Step 5: Solve for x
    x = 81,043,676,611.77/279,438.68
  6. Step 6: Final answer
    x = 290,023.12

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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.