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Finding the Fourth Proportional to 129,362, 178,529.82 and 72,777.56

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Solution

The fourth proportional to 129,362, 178,529.82 and 72,777.56 is: 100,438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,362 : 178,529.82 = 72,777.56 : x
  2. Step 2: Convert to fraction form
    129,362/178,529.82 = 72,777.56/x
  3. Step 3: Cross multiply
    129,362x = 178,529.82 × 72,777.56
  4. Step 4: Simplify right side
    129,362x = 12,992,964,686.84
  5. Step 5: Solve for x
    x = 12,992,964,686.84/129,362
  6. Step 6: Final answer
    x = 100,438.80

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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.