Home / 128,956.36-177,963.28-72,371.20

Finding the Fourth Proportional to 128,956.36, 177,963.28 and 72,371.20

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Solution

The fourth proportional to 128,956.36, 177,963.28 and 72,371.20 is: 99,874.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,956.36 : 177,963.28 = 72,371.20 : x
  2. Step 2: Convert to fraction form
    128,956.36/177,963.28 = 72,371.20/x
  3. Step 3: Cross multiply
    128,956.36x = 177,963.28 × 72,371.20
  4. Step 4: Simplify right side
    128,956.36x = 12,879,416,129.54
  5. Step 5: Solve for x
    x = 12,879,416,129.54/128,956.36
  6. Step 6: Final answer
    x = 99,874.22

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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.