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Finding the Fourth Proportional to 138,443.42, 191,051.92 and 74,781.23

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Solution

The fourth proportional to 138,443.42, 191,051.92 and 74,781.23 is: 103,198.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,443.42 : 191,051.92 = 74,781.23 : x
  2. Step 2: Convert to fraction form
    138,443.42/191,051.92 = 74,781.23/x
  3. Step 3: Cross multiply
    138,443.42x = 191,051.92 × 74,781.23
  4. Step 4: Simplify right side
    138,443.42x = 14,287,096,709.68
  5. Step 5: Solve for x
    x = 14,287,096,709.68/138,443.42
  6. Step 6: Final answer
    x = 103,198.09

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1.5x scale

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.