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Finding the Fourth Proportional to 128,055.60, 192,112.20 and 39,313.20

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Solution

The fourth proportional to 128,055.60, 192,112.20 and 39,313.20 is: 58,978.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,055.60 : 192,112.20 = 39,313.20 : x
  2. Step 2: Convert to fraction form
    128,055.60/192,112.20 = 39,313.20/x
  3. Step 3: Cross multiply
    128,055.60x = 192,112.20 × 39,313.20
  4. Step 4: Simplify right side
    128,055.60x = 7,552,545,341.04
  5. Step 5: Solve for x
    x = 7,552,545,341.04/128,055.60
  6. Step 6: Final answer
    x = 58,978.64

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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.