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Finding the Fourth Proportional to 80,318.70, 120,483.96 and 21,153.94

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Solution

The fourth proportional to 80,318.70, 120,483.96 and 21,153.94 is: 31,732.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,318.70 : 120,483.96 = 21,153.94 : x
  2. Step 2: Convert to fraction form
    80,318.70/120,483.96 = 21,153.94/x
  3. Step 3: Cross multiply
    80,318.70x = 120,483.96 × 21,153.94
  4. Step 4: Simplify right side
    80,318.70x = 2,548,710,080.27
  5. Step 5: Solve for x
    x = 2,548,710,080.27/80,318.70
  6. Step 6: Final answer
    x = 31,732.46

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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.