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Finding the Fourth Proportional to 123,387.76, 170,291.28 and 91,647.28

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Solution

The fourth proportional to 123,387.76, 170,291.28 and 91,647.28 is: 126,485.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,387.76 : 170,291.28 = 91,647.28 : x
  2. Step 2: Convert to fraction form
    123,387.76/170,291.28 = 91,647.28/x
  3. Step 3: Cross multiply
    123,387.76x = 170,291.28 × 91,647.28
  4. Step 4: Simplify right side
    123,387.76x = 15,606,732,619.72
  5. Step 5: Solve for x
    x = 15,606,732,619.72/123,387.76
  6. Step 6: Final answer
    x = 126,485.26

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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.