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Finding the Fourth Proportional to 80,603.58, 120,905.19 and 21,439.29

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Solution

The fourth proportional to 80,603.58, 120,905.19 and 21,439.29 is: 32,158.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,603.58 : 120,905.19 = 21,439.29 : x
  2. Step 2: Convert to fraction form
    80,603.58/120,905.19 = 21,439.29/x
  3. Step 3: Cross multiply
    80,603.58x = 120,905.19 × 21,439.29
  4. Step 4: Simplify right side
    80,603.58x = 2,592,121,430.92
  5. Step 5: Solve for x
    x = 2,592,121,430.92/80,603.58
  6. Step 6: Final answer
    x = 32,158.89

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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.