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Finding the Fourth Proportional to 128,967.66, 177,991.77 and 72,379.03

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Solution

The fourth proportional to 128,967.66, 177,991.77 and 72,379.03 is: 99,892.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,967.66 : 177,991.77 = 72,379.03 : x
  2. Step 2: Convert to fraction form
    128,967.66/177,991.77 = 72,379.03/x
  3. Step 3: Cross multiply
    128,967.66x = 177,991.77 × 72,379.03
  4. Step 4: Simplify right side
    128,967.66x = 12,882,871,660.58
  5. Step 5: Solve for x
    x = 12,882,871,660.58/128,967.66
  6. Step 6: Final answer
    x = 99,892.26

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1.5x scale

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.