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Finding the Fourth Proportional to 128,872.50, 177,844.16 and 72,283.88

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Solution

The fourth proportional to 128,872.50, 177,844.16 and 72,283.88 is: 99,751.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,872.50 : 177,844.16 = 72,283.88 : x
  2. Step 2: Convert to fraction form
    128,872.50/177,844.16 = 72,283.88/x
  3. Step 3: Cross multiply
    128,872.50x = 177,844.16 × 72,283.88
  4. Step 4: Simplify right side
    128,872.50x = 12,855,264,669.50
  5. Step 5: Solve for x
    x = 12,855,264,669.50/128,872.50
  6. Step 6: Final answer
    x = 99,751.81

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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.