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Finding the Fourth Proportional to 123,139.36, 169,853.52 and 85,399.84

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Solution

The fourth proportional to 123,139.36, 169,853.52 and 85,399.84 is: 117,797.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,139.36 : 169,853.52 = 85,399.84 : x
  2. Step 2: Convert to fraction form
    123,139.36/169,853.52 = 85,399.84/x
  3. Step 3: Cross multiply
    123,139.36x = 169,853.52 × 85,399.84
  4. Step 4: Simplify right side
    123,139.36x = 14,505,463,431.44
  5. Step 5: Solve for x
    x = 14,505,463,431.44/123,139.36
  6. Step 6: Final answer
    x = 117,797.13

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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.