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Finding the Fourth Proportional to 78,930.99, 108,923.40 and 43,120.08

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Solution

The fourth proportional to 78,930.99, 108,923.40 and 43,120.08 is: 59,504.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,930.99 : 108,923.40 = 43,120.08 : x
  2. Step 2: Convert to fraction form
    78,930.99/108,923.40 = 43,120.08/x
  3. Step 3: Cross multiply
    78,930.99x = 108,923.40 × 43,120.08
  4. Step 4: Simplify right side
    78,930.99x = 4,696,785,721.87
  5. Step 5: Solve for x
    x = 4,696,785,721.87/78,930.99
  6. Step 6: Final answer
    x = 59,504.96

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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.