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Finding the Fourth Proportional to 111,478, 153,789.40 and 66,157.90

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Solution

The fourth proportional to 111,478, 153,789.40 and 66,157.90 is: 91,268.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,478 : 153,789.40 = 66,157.90 : x
  2. Step 2: Convert to fraction form
    111,478/153,789.40 = 66,157.90/x
  3. Step 3: Cross multiply
    111,478x = 153,789.40 × 66,157.90
  4. Step 4: Simplify right side
    111,478x = 10,174,383,746.26
  5. Step 5: Solve for x
    x = 10,174,383,746.26/111,478
  6. Step 6: Final answer
    x = 91,268.09

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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.