Home / 129,531.72-178,762.92-72,174.81

Finding the Fourth Proportional to 129,531.72, 178,762.92 and 72,174.81

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Solution

The fourth proportional to 129,531.72, 178,762.92 and 72,174.81 is: 99,606.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,531.72 : 178,762.92 = 72,174.81 : x
  2. Step 2: Convert to fraction form
    129,531.72/178,762.92 = 72,174.81/x
  3. Step 3: Cross multiply
    129,531.72x = 178,762.92 × 72,174.81
  4. Step 4: Simplify right side
    129,531.72x = 12,902,179,786.05
  5. Step 5: Solve for x
    x = 12,902,179,786.05/129,531.72
  6. Step 6: Final answer
    x = 99,606.33

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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.