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Finding the Fourth Proportional to 218,984.80, 328,486.92 and 85,853.20

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Solution

The fourth proportional to 218,984.80, 328,486.92 and 85,853.20 is: 128,783.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,984.80 : 328,486.92 = 85,853.20 : x
  2. Step 2: Convert to fraction form
    218,984.80/328,486.92 = 85,853.20/x
  3. Step 3: Cross multiply
    218,984.80x = 328,486.92 × 85,853.20
  4. Step 4: Simplify right side
    218,984.80x = 28,201,653,240.14
  5. Step 5: Solve for x
    x = 28,201,653,240.14/218,984.80
  6. Step 6: Final answer
    x = 128,783.61

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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.