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Finding the Fourth Proportional to 324,878.64, 486,990.72 and 135,443.85

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Solution

The fourth proportional to 324,878.64, 486,990.72 and 135,443.85 is: 203,029.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    324,878.64 : 486,990.72 = 135,443.85 : x
  2. Step 2: Convert to fraction form
    324,878.64/486,990.72 = 135,443.85/x
  3. Step 3: Cross multiply
    324,878.64x = 486,990.72 × 135,443.85
  4. Step 4: Simplify right side
    324,878.64x = 65,959,898,031.07
  5. Step 5: Solve for x
    x = 65,959,898,031.07/324,878.64
  6. Step 6: Final answer
    x = 203,029.35

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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.