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Finding the Fourth Proportional to 79,211.62, 109,322.21 and 45,212.31

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Solution

The fourth proportional to 79,211.62, 109,322.21 and 45,212.31 is: 62,398.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,211.62 : 109,322.21 = 45,212.31 : x
  2. Step 2: Convert to fraction form
    79,211.62/109,322.21 = 45,212.31/x
  3. Step 3: Cross multiply
    79,211.62x = 109,322.21 × 45,212.31
  4. Step 4: Simplify right side
    79,211.62x = 4,942,709,968.32
  5. Step 5: Solve for x
    x = 4,942,709,968.32/79,211.62
  6. Step 6: Final answer
    x = 62,398.80

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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.