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Finding the Fourth Proportional to 138,249.84, 190,789.08 and 78,637.68

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Solution

The fourth proportional to 138,249.84, 190,789.08 and 78,637.68 is: 108,522.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,249.84 : 190,789.08 = 78,637.68 : x
  2. Step 2: Convert to fraction form
    138,249.84/190,789.08 = 78,637.68/x
  3. Step 3: Cross multiply
    138,249.84x = 190,789.08 × 78,637.68
  4. Step 4: Simplify right side
    138,249.84x = 15,003,210,620.53
  5. Step 5: Solve for x
    x = 15,003,210,620.53/138,249.84
  6. Step 6: Final answer
    x = 108,522.44

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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.