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Finding the Fourth Proportional to 212,871.69, 319,134.38 and 79,677.32

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Solution

The fourth proportional to 212,871.69, 319,134.38 and 79,677.32 is: 119,451.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,871.69 : 319,134.38 = 79,677.32 : x
  2. Step 2: Convert to fraction form
    212,871.69/319,134.38 = 79,677.32/x
  3. Step 3: Cross multiply
    212,871.69x = 319,134.38 × 79,677.32
  4. Step 4: Simplify right side
    212,871.69x = 25,427,770,124.20
  5. Step 5: Solve for x
    x = 25,427,770,124.20/212,871.69
  6. Step 6: Final answer
    x = 119,451.16

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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.