Home / 212,971.86-319,579.89-86,588.76

Finding the Fourth Proportional to 212,971.86, 319,579.89 and 86,588.76

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Solution

The fourth proportional to 212,971.86, 319,579.89 and 86,588.76 is: 129,932.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,971.86 : 319,579.89 = 86,588.76 : x
  2. Step 2: Convert to fraction form
    212,971.86/319,579.89 = 86,588.76/x
  3. Step 3: Cross multiply
    212,971.86x = 319,579.89 × 86,588.76
  4. Step 4: Simplify right side
    212,971.86x = 27,672,026,396.04
  5. Step 5: Solve for x
    x = 27,672,026,396.04/212,971.86
  6. Step 6: Final answer
    x = 129,932.78

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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.