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Finding the Fourth Proportional to 115,287.20, 172,930.80 and 91,959.20

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Solution

The fourth proportional to 115,287.20, 172,930.80 and 91,959.20 is: 137,938.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,287.20 : 172,930.80 = 91,959.20 : x
  2. Step 2: Convert to fraction form
    115,287.20/172,930.80 = 91,959.20/x
  3. Step 3: Cross multiply
    115,287.20x = 172,930.80 × 91,959.20
  4. Step 4: Simplify right side
    115,287.20x = 15,902,578,023.36
  5. Step 5: Solve for x
    x = 15,902,578,023.36/115,287.20
  6. Step 6: Final answer
    x = 137,938.80

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1.5x scale

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.