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Finding the Fourth Proportional to 128,072.40, 176,736.24 and 71,482.56

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Solution

The fourth proportional to 128,072.40, 176,736.24 and 71,482.56 is: 98,643.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.40 : 176,736.24 = 71,482.56 : x
  2. Step 2: Convert to fraction form
    128,072.40/176,736.24 = 71,482.56/x
  3. Step 3: Cross multiply
    128,072.40x = 176,736.24 × 71,482.56
  4. Step 4: Simplify right side
    128,072.40x = 12,633,558,879.97
  5. Step 5: Solve for x
    x = 12,633,558,879.97/128,072.40
  6. Step 6: Final answer
    x = 98,643.88

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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.