Home / 128,981.82-177,985.14-72,382.26

Finding the Fourth Proportional to 128,981.82, 177,985.14 and 72,382.26

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Solution

The fourth proportional to 128,981.82, 177,985.14 and 72,382.26 is: 99,882.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.82 : 177,985.14 = 72,382.26 : x
  2. Step 2: Convert to fraction form
    128,981.82/177,985.14 = 72,382.26/x
  3. Step 3: Cross multiply
    128,981.82x = 177,985.14 × 72,382.26
  4. Step 4: Simplify right side
    128,981.82x = 12,882,966,679.62
  5. Step 5: Solve for x
    x = 12,882,966,679.62/128,981.82
  6. Step 6: Final answer
    x = 99,882.04

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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.