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Finding the Fourth Proportional to 128,287.20, 192,430.80 and 104,959.20

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Solution

The fourth proportional to 128,287.20, 192,430.80 and 104,959.20 is: 157,438.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,287.20 : 192,430.80 = 104,959.20 : x
  2. Step 2: Convert to fraction form
    128,287.20/192,430.80 = 104,959.20/x
  3. Step 3: Cross multiply
    128,287.20x = 192,430.80 × 104,959.20
  4. Step 4: Simplify right side
    128,287.20x = 20,197,382,823.36
  5. Step 5: Solve for x
    x = 20,197,382,823.36/128,287.20
  6. Step 6: Final answer
    x = 157,438.80

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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.