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Finding the Fourth Proportional to 129,430.37, 178,669.03 and 87,013.51

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Solution

The fourth proportional to 129,430.37, 178,669.03 and 87,013.51 is: 120,115.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,430.37 : 178,669.03 = 87,013.51 : x
  2. Step 2: Convert to fraction form
    129,430.37/178,669.03 = 87,013.51/x
  3. Step 3: Cross multiply
    129,430.37x = 178,669.03 × 87,013.51
  4. Step 4: Simplify right side
    129,430.37x = 15,546,618,764.39
  5. Step 5: Solve for x
    x = 15,546,618,764.39/129,430.37
  6. Step 6: Final answer
    x = 120,115.69

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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.