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Finding the Fourth Proportional to 213,081.90, 319,539.69 and 79,889.46

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Solution

The fourth proportional to 213,081.90, 319,539.69 and 79,889.46 is: 119,803.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,081.90 : 319,539.69 = 79,889.46 : x
  2. Step 2: Convert to fraction form
    213,081.90/319,539.69 = 79,889.46/x
  3. Step 3: Cross multiply
    213,081.90x = 319,539.69 × 79,889.46
  4. Step 4: Simplify right side
    213,081.90x = 25,527,853,282.67
  5. Step 5: Solve for x
    x = 25,527,853,282.67/213,081.90
  6. Step 6: Final answer
    x = 119,803.01

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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.