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Finding the Fourth Proportional to 73,921.68, 102,009.78 and 40,387.68

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Solution

The fourth proportional to 73,921.68, 102,009.78 and 40,387.68 is: 55,733.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,921.68 : 102,009.78 = 40,387.68 : x
  2. Step 2: Convert to fraction form
    73,921.68/102,009.78 = 40,387.68/x
  3. Step 3: Cross multiply
    73,921.68x = 102,009.78 × 40,387.68
  4. Step 4: Simplify right side
    73,921.68x = 4,119,938,351.51
  5. Step 5: Solve for x
    x = 4,119,938,351.51/73,921.68
  6. Step 6: Final answer
    x = 55,733.83

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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.