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Finding the Fourth Proportional to 131,660, 181,690.92 and 72,044

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Solution

The fourth proportional to 131,660, 181,690.92 and 72,044 is: 99,420.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,660 : 181,690.92 = 72,044 : x
  2. Step 2: Convert to fraction form
    131,660/181,690.92 = 72,044/x
  3. Step 3: Cross multiply
    131,660x = 181,690.92 × 72,044
  4. Step 4: Simplify right side
    131,660x = 13,089,740,640.48
  5. Step 5: Solve for x
    x = 13,089,740,640.48/131,660
  6. Step 6: Final answer
    x = 99,420.79

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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.