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Finding the Fourth Proportional to 72,939.66, 100,656.75 and 39,405.66

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Solution

The fourth proportional to 72,939.66, 100,656.75 and 39,405.66 is: 54,379.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,939.66 : 100,656.75 = 39,405.66 : x
  2. Step 2: Convert to fraction form
    72,939.66/100,656.75 = 39,405.66/x
  3. Step 3: Cross multiply
    72,939.66x = 100,656.75 × 39,405.66
  4. Step 4: Simplify right side
    72,939.66x = 3,966,445,667.21
  5. Step 5: Solve for x
    x = 3,966,445,667.21/72,939.66
  6. Step 6: Final answer
    x = 54,379.82

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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.