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Finding the Fourth Proportional to 128,661.75, 192,779.46 and 91,035.36

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Solution

The fourth proportional to 128,661.75, 192,779.46 and 91,035.36 is: 136,402.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,661.75 : 192,779.46 = 91,035.36 : x
  2. Step 2: Convert to fraction form
    128,661.75/192,779.46 = 91,035.36/x
  3. Step 3: Cross multiply
    128,661.75x = 192,779.46 × 91,035.36
  4. Step 4: Simplify right side
    128,661.75x = 17,549,747,541.71
  5. Step 5: Solve for x
    x = 17,549,747,541.71/128,661.75
  6. Step 6: Final answer
    x = 136,402.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.