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Finding the Fourth Proportional to 72,119.68, 99,523.21 and 39,412.80

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Solution

The fourth proportional to 72,119.68, 99,523.21 and 39,412.80 is: 54,388.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,119.68 : 99,523.21 = 39,412.80 : x
  2. Step 2: Convert to fraction form
    72,119.68/99,523.21 = 39,412.80/x
  3. Step 3: Cross multiply
    72,119.68x = 99,523.21 × 39,412.80
  4. Step 4: Simplify right side
    72,119.68x = 3,922,488,371.09
  5. Step 5: Solve for x
    x = 3,922,488,371.09/72,119.68
  6. Step 6: Final answer
    x = 54,388.60

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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.