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Finding the Fourth Proportional to 128,039.71, 176,694.95 and 71,451.07

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Solution

The fourth proportional to 128,039.71, 176,694.95 and 71,451.07 is: 98,602.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,039.71 : 176,694.95 = 71,451.07 : x
  2. Step 2: Convert to fraction form
    128,039.71/176,694.95 = 71,451.07/x
  3. Step 3: Cross multiply
    128,039.71x = 176,694.95 × 71,451.07
  4. Step 4: Simplify right side
    128,039.71x = 12,625,042,883.84
  5. Step 5: Solve for x
    x = 12,625,042,883.84/128,039.71
  6. Step 6: Final answer
    x = 98,602.56

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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.