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Finding the Fourth Proportional to 141,031.62, 211,735.15 and 81,909.72

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Solution

The fourth proportional to 141,031.62, 211,735.15 and 81,909.72 is: 122,973.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    141,031.62 : 211,735.15 = 81,909.72 : x
  2. Step 2: Convert to fraction form
    141,031.62/211,735.15 = 81,909.72/x
  3. Step 3: Cross multiply
    141,031.62x = 211,735.15 × 81,909.72
  4. Step 4: Simplify right side
    141,031.62x = 17,343,166,850.66
  5. Step 5: Solve for x
    x = 17,343,166,850.66/141,031.62
  6. Step 6: Final answer
    x = 122,973.61

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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.