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Finding the Fourth Proportional to 123,690.88, 170,853.60 and 91,491

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Solution

The fourth proportional to 123,690.88, 170,853.60 and 91,491 is: 126,376.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,690.88 : 170,853.60 = 91,491 : x
  2. Step 2: Convert to fraction form
    123,690.88/170,853.60 = 91,491/x
  3. Step 3: Cross multiply
    123,690.88x = 170,853.60 × 91,491
  4. Step 4: Simplify right side
    123,690.88x = 15,631,566,717.60
  5. Step 5: Solve for x
    x = 15,631,566,717.60/123,690.88
  6. Step 6: Final answer
    x = 126,376.07

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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.