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Finding the Fourth Proportional to 138,652.77, 191,340.81 and 74,990.55

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Solution

The fourth proportional to 138,652.77, 191,340.81 and 74,990.55 is: 103,486.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,652.77 : 191,340.81 = 74,990.55 : x
  2. Step 2: Convert to fraction form
    138,652.77/191,340.81 = 74,990.55/x
  3. Step 3: Cross multiply
    138,652.77x = 191,340.81 × 74,990.55
  4. Step 4: Simplify right side
    138,652.77x = 14,348,752,579.35
  5. Step 5: Solve for x
    x = 14,348,752,579.35/138,652.77
  6. Step 6: Final answer
    x = 103,486.95

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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.