Home / 128,927.25-177,920.82-72,339.84

Finding the Fourth Proportional to 128,927.25, 177,920.82 and 72,339.84

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Solution

The fourth proportional to 128,927.25, 177,920.82 and 72,339.84 is: 99,829.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,927.25 : 177,920.82 = 72,339.84 : x
  2. Step 2: Convert to fraction form
    128,927.25/177,920.82 = 72,339.84/x
  3. Step 3: Cross multiply
    128,927.25x = 177,920.82 × 72,339.84
  4. Step 4: Simplify right side
    128,927.25x = 12,870,763,651.47
  5. Step 5: Solve for x
    x = 12,870,763,651.47/128,927.25
  6. Step 6: Final answer
    x = 99,829.66

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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.