Home / 128,605.20-177,561.79-80,280.70

Finding the Fourth Proportional to 128,605.20, 177,561.79 and 80,280.70

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Solution

The fourth proportional to 128,605.20, 177,561.79 and 80,280.70 is: 110,841.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,605.20 : 177,561.79 = 80,280.70 : x
  2. Step 2: Convert to fraction form
    128,605.20/177,561.79 = 80,280.70/x
  3. Step 3: Cross multiply
    128,605.20x = 177,561.79 × 80,280.70
  4. Step 4: Simplify right side
    128,605.20x = 14,254,785,148.63
  5. Step 5: Solve for x
    x = 14,254,785,148.63/128,605.20
  6. Step 6: Final answer
    x = 110,841.44

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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.