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Finding the Fourth Proportional to 131,289, 181,179.90 and 71,673

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Solution

The fourth proportional to 131,289, 181,179.90 and 71,673 is: 98,909.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,289 : 181,179.90 = 71,673 : x
  2. Step 2: Convert to fraction form
    131,289/181,179.90 = 71,673/x
  3. Step 3: Cross multiply
    131,289x = 181,179.90 × 71,673
  4. Step 4: Simplify right side
    131,289x = 12,985,706,972.70
  5. Step 5: Solve for x
    x = 12,985,706,972.70/131,289
  6. Step 6: Final answer
    x = 98,909.33

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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.