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Finding the Fourth Proportional to 153,489.03, 211,811.67 and 85,505.91

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Solution

The fourth proportional to 153,489.03, 211,811.67 and 85,505.91 is: 117,996.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,489.03 : 211,811.67 = 85,505.91 : x
  2. Step 2: Convert to fraction form
    153,489.03/211,811.67 = 85,505.91/x
  3. Step 3: Cross multiply
    153,489.03x = 211,811.67 × 85,505.91
  4. Step 4: Simplify right side
    153,489.03x = 18,111,149,591.97
  5. Step 5: Solve for x
    x = 18,111,149,591.97/153,489.03
  6. Step 6: Final answer
    x = 117,996.38

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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.