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Finding the Fourth Proportional to 172,112.76, 258,013.62 and 61,278.84

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Solution

The fourth proportional to 172,112.76, 258,013.62 and 61,278.84 is: 91,862.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,112.76 : 258,013.62 = 61,278.84 : x
  2. Step 2: Convert to fraction form
    172,112.76/258,013.62 = 61,278.84/x
  3. Step 3: Cross multiply
    172,112.76x = 258,013.62 × 61,278.84
  4. Step 4: Simplify right side
    172,112.76x = 15,810,775,337.80
  5. Step 5: Solve for x
    x = 15,810,775,337.80/172,112.76
  6. Step 6: Final answer
    x = 91,862.89

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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.