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Finding the Fourth Proportional to 259,628.90, 389,479.80 and 82,117.40

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Solution

The fourth proportional to 259,628.90, 389,479.80 and 82,117.40 is: 123,187.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,628.90 : 389,479.80 = 82,117.40 : x
  2. Step 2: Convert to fraction form
    259,628.90/389,479.80 = 82,117.40/x
  3. Step 3: Cross multiply
    259,628.90x = 389,479.80 × 82,117.40
  4. Step 4: Simplify right side
    259,628.90x = 31,983,068,528.52
  5. Step 5: Solve for x
    x = 31,983,068,528.52/259,628.90
  6. Step 6: Final answer
    x = 123,187.63

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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.