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Finding the Fourth Proportional to 100,618.92, 138,854.01 and 55,299.81

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Solution

The fourth proportional to 100,618.92, 138,854.01 and 55,299.81 is: 76,313.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,618.92 : 138,854.01 = 55,299.81 : x
  2. Step 2: Convert to fraction form
    100,618.92/138,854.01 = 55,299.81/x
  3. Step 3: Cross multiply
    100,618.92x = 138,854.01 × 55,299.81
  4. Step 4: Simplify right side
    100,618.92x = 7,678,600,370.74
  5. Step 5: Solve for x
    x = 7,678,600,370.74/100,618.92
  6. Step 6: Final answer
    x = 76,313.68

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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.