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Finding the Fourth Proportional to 159,317.89, 219,858.68 and 86,721.07

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Solution

The fourth proportional to 159,317.89, 219,858.68 and 86,721.07 is: 119,675.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,317.89 : 219,858.68 = 86,721.07 : x
  2. Step 2: Convert to fraction form
    159,317.89/219,858.68 = 86,721.07/x
  3. Step 3: Cross multiply
    159,317.89x = 219,858.68 × 86,721.07
  4. Step 4: Simplify right side
    159,317.89x = 19,066,378,445.49
  5. Step 5: Solve for x
    x = 19,066,378,445.49/159,317.89
  6. Step 6: Final answer
    x = 119,675.06

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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.