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Finding the Fourth Proportional to 92,612.80, 138,989.49 and 61,012.09

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Solution

The fourth proportional to 92,612.80, 138,989.49 and 61,012.09 is: 91,564.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    92,612.80 : 138,989.49 = 61,012.09 : x
  2. Step 2: Convert to fraction form
    92,612.80/138,989.49 = 61,012.09/x
  3. Step 3: Cross multiply
    92,612.80x = 138,989.49 × 61,012.09
  4. Step 4: Simplify right side
    92,612.80x = 8,480,039,272.93
  5. Step 5: Solve for x
    x = 8,480,039,272.93/92,612.80
  6. Step 6: Final answer
    x = 91,564.44

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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.