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Finding the Fourth Proportional to 78,085.65, 107,939.79 and 69,671.16

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Solution

The fourth proportional to 78,085.65, 107,939.79 and 69,671.16 is: 96,308.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,085.65 : 107,939.79 = 69,671.16 : x
  2. Step 2: Convert to fraction form
    78,085.65/107,939.79 = 69,671.16/x
  3. Step 3: Cross multiply
    78,085.65x = 107,939.79 × 69,671.16
  4. Step 4: Simplify right side
    78,085.65x = 7,520,290,379.46
  5. Step 5: Solve for x
    x = 7,520,290,379.46/78,085.65
  6. Step 6: Final answer
    x = 96,308.23

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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.