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Finding the Fourth Proportional to 153,171.90, 211,375.35 and 86,103.90

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Solution

The fourth proportional to 153,171.90, 211,375.35 and 86,103.90 is: 118,822.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    153,171.90 : 211,375.35 = 86,103.90 : x
  2. Step 2: Convert to fraction form
    153,171.90/211,375.35 = 86,103.90/x
  3. Step 3: Cross multiply
    153,171.90x = 211,375.35 × 86,103.90
  4. Step 4: Simplify right side
    153,171.90x = 18,200,241,998.87
  5. Step 5: Solve for x
    x = 18,200,241,998.87/153,171.90
  6. Step 6: Final answer
    x = 118,822.33

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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.