Home / 128,949.23-177,950.05-72,360.61

Finding the Fourth Proportional to 128,949.23, 177,950.05 and 72,360.61

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Solution

The fourth proportional to 128,949.23, 177,950.05 and 72,360.61 is: 99,857.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,949.23 : 177,950.05 = 72,360.61 : x
  2. Step 2: Convert to fraction form
    128,949.23/177,950.05 = 72,360.61/x
  3. Step 3: Cross multiply
    128,949.23x = 177,950.05 × 72,360.61
  4. Step 4: Simplify right side
    128,949.23x = 12,876,573,541.75
  5. Step 5: Solve for x
    x = 12,876,573,541.75/128,949.23
  6. Step 6: Final answer
    x = 99,857.70

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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.