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Finding the Fourth Proportional to 159,603.31, 220,254.11 and 87,985.90

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Solution

The fourth proportional to 159,603.31, 220,254.11 and 87,985.90 is: 121,421.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,603.31 : 220,254.11 = 87,985.90 : x
  2. Step 2: Convert to fraction form
    159,603.31/220,254.11 = 87,985.90/x
  3. Step 3: Cross multiply
    159,603.31x = 220,254.11 × 87,985.90
  4. Step 4: Simplify right side
    159,603.31x = 19,379,256,097.05
  5. Step 5: Solve for x
    x = 19,379,256,097.05/159,603.31
  6. Step 6: Final answer
    x = 121,421.39

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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.