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Finding the Fourth Proportional to 220,530.86, 330,489.84 and 115,139.60

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Solution

The fourth proportional to 220,530.86, 330,489.84 and 115,139.60 is: 172,549.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,530.86 : 330,489.84 = 115,139.60 : x
  2. Step 2: Convert to fraction form
    220,530.86/330,489.84 = 115,139.60/x
  3. Step 3: Cross multiply
    220,530.86x = 330,489.84 × 115,139.60
  4. Step 4: Simplify right side
    220,530.86x = 38,052,467,981.66
  5. Step 5: Solve for x
    x = 38,052,467,981.66/220,530.86
  6. Step 6: Final answer
    x = 172,549.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.