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Finding the Fourth Proportional to 128,072.66, 176,723.97 and 71,486.42

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Solution

The fourth proportional to 128,072.66, 176,723.97 and 71,486.42 is: 98,642.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,072.66 : 176,723.97 = 71,486.42 : x
  2. Step 2: Convert to fraction form
    128,072.66/176,723.97 = 71,486.42/x
  3. Step 3: Cross multiply
    128,072.66x = 176,723.97 × 71,486.42
  4. Step 4: Simplify right side
    128,072.66x = 12,633,363,943.49
  5. Step 5: Solve for x
    x = 12,633,363,943.49/128,072.66
  6. Step 6: Final answer
    x = 98,642.16

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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.