Home / 128,981.87-177,985.23-72,382.31

Finding the Fourth Proportional to 128,981.87, 177,985.23 and 72,382.31

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Solution

The fourth proportional to 128,981.87, 177,985.23 and 72,382.31 is: 99,882.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,981.87 : 177,985.23 = 72,382.31 : x
  2. Step 2: Convert to fraction form
    128,981.87/177,985.23 = 72,382.31/x
  3. Step 3: Cross multiply
    128,981.87x = 177,985.23 × 72,382.31
  4. Step 4: Simplify right side
    128,981.87x = 12,882,982,176.33
  5. Step 5: Solve for x
    x = 12,882,982,176.33/128,981.87
  6. Step 6: Final answer
    x = 99,882.11

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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.