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Finding the Fourth Proportional to 128,966.84, 177,991.62 and 72,381.32

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Solution

The fourth proportional to 128,966.84, 177,991.62 and 72,381.32 is: 99,895.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,966.84 : 177,991.62 = 72,381.32 : x
  2. Step 2: Convert to fraction form
    128,966.84/177,991.62 = 72,381.32/x
  3. Step 3: Cross multiply
    128,966.84x = 177,991.62 × 72,381.32
  4. Step 4: Simplify right side
    128,966.84x = 12,883,268,404.54
  5. Step 5: Solve for x
    x = 12,883,268,404.54/128,966.84
  6. Step 6: Final answer
    x = 99,895.98

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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.