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Finding the Fourth Proportional to 79,051.92, 109,131.48 and 61,106.40

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Solution

The fourth proportional to 79,051.92, 109,131.48 and 61,106.40 is: 84,357.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,051.92 : 109,131.48 = 61,106.40 : x
  2. Step 2: Convert to fraction form
    79,051.92/109,131.48 = 61,106.40/x
  3. Step 3: Cross multiply
    79,051.92x = 109,131.48 × 61,106.40
  4. Step 4: Simplify right side
    79,051.92x = 6,668,631,869.47
  5. Step 5: Solve for x
    x = 6,668,631,869.47/79,051.92
  6. Step 6: Final answer
    x = 84,357.62

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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.