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Finding the Fourth Proportional to 129,378.72, 178,545.44 and 72,021

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Solution

The fourth proportional to 129,378.72, 178,545.44 and 72,021 is: 99,390.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,378.72 : 178,545.44 = 72,021 : x
  2. Step 2: Convert to fraction form
    129,378.72/178,545.44 = 72,021/x
  3. Step 3: Cross multiply
    129,378.72x = 178,545.44 × 72,021
  4. Step 4: Simplify right side
    129,378.72x = 12,859,021,134.24
  5. Step 5: Solve for x
    x = 12,859,021,134.24/129,378.72
  6. Step 6: Final answer
    x = 99,390.54

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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.