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Finding the Fourth Proportional to 138,072.61, 207,111.47 and 43,300.68

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Solution

The fourth proportional to 138,072.61, 207,111.47 and 43,300.68 is: 64,951.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,072.61 : 207,111.47 = 43,300.68 : x
  2. Step 2: Convert to fraction form
    138,072.61/207,111.47 = 43,300.68/x
  3. Step 3: Cross multiply
    138,072.61x = 207,111.47 × 43,300.68
  4. Step 4: Simplify right side
    138,072.61x = 8,968,067,486.80
  5. Step 5: Solve for x
    x = 8,968,067,486.80/138,072.61
  6. Step 6: Final answer
    x = 64,951.82

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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.