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Finding the Fourth Proportional to 172,487.66, 258,644.01 and 78,913.22

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Solution

The fourth proportional to 172,487.66, 258,644.01 and 78,913.22 is: 118,329.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,487.66 : 258,644.01 = 78,913.22 : x
  2. Step 2: Convert to fraction form
    172,487.66/258,644.01 = 78,913.22/x
  3. Step 3: Cross multiply
    172,487.66x = 258,644.01 × 78,913.22
  4. Step 4: Simplify right side
    172,487.66x = 20,410,431,662.81
  5. Step 5: Solve for x
    x = 20,410,431,662.81/172,487.66
  6. Step 6: Final answer
    x = 118,329.81

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.