Home / 128,928.25-177,924.05-72,343.81

Finding the Fourth Proportional to 128,928.25, 177,924.05 and 72,343.81

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Solution

The fourth proportional to 128,928.25, 177,924.05 and 72,343.81 is: 99,836.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,928.25 : 177,924.05 = 72,343.81 : x
  2. Step 2: Convert to fraction form
    128,928.25/177,924.05 = 72,343.81/x
  3. Step 3: Cross multiply
    128,928.25x = 177,924.05 × 72,343.81
  4. Step 4: Simplify right side
    128,928.25x = 12,871,703,667.63
  5. Step 5: Solve for x
    x = 12,871,703,667.63/128,928.25
  6. Step 6: Final answer
    x = 99,836.18

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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.