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Finding the Fourth Proportional to 172,812.89, 259,263.08 and 72,921.67

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Solution

The fourth proportional to 172,812.89, 259,263.08 and 72,921.67 is: 109,400.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,812.89 : 259,263.08 = 72,921.67 : x
  2. Step 2: Convert to fraction form
    172,812.89/259,263.08 = 72,921.67/x
  3. Step 3: Cross multiply
    172,812.89x = 259,263.08 × 72,921.67
  4. Step 4: Simplify right side
    172,812.89x = 18,905,896,023.63
  5. Step 5: Solve for x
    x = 18,905,896,023.63/172,812.89
  6. Step 6: Final answer
    x = 109,400.96

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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.