Home / 128,696.20-177,600.78-72,108.04

Finding the Fourth Proportional to 128,696.20, 177,600.78 and 72,108.04

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Solution

The fourth proportional to 128,696.20, 177,600.78 and 72,108.04 is: 99,509.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,696.20 : 177,600.78 = 72,108.04 : x
  2. Step 2: Convert to fraction form
    128,696.20/177,600.78 = 72,108.04/x
  3. Step 3: Cross multiply
    128,696.20x = 177,600.78 × 72,108.04
  4. Step 4: Simplify right side
    128,696.20x = 12,806,444,148.27
  5. Step 5: Solve for x
    x = 12,806,444,148.27/128,696.20
  6. Step 6: Final answer
    x = 99,509.11

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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.