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Finding the Fourth Proportional to 159,603.21, 220,253.92 and 87,985.78

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Solution

The fourth proportional to 159,603.21, 220,253.92 and 87,985.78 is: 121,421.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,603.21 : 220,253.92 = 87,985.78 : x
  2. Step 2: Convert to fraction form
    159,603.21/220,253.92 = 87,985.78/x
  3. Step 3: Cross multiply
    159,603.21x = 220,253.92 × 87,985.78
  4. Step 4: Simplify right side
    159,603.21x = 19,379,212,178.66
  5. Step 5: Solve for x
    x = 19,379,212,178.66/159,603.21
  6. Step 6: Final answer
    x = 121,421.19

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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.