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Finding the Fourth Proportional to 128,272.60, 192,117.30 and 81,033.40

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Solution

The fourth proportional to 128,272.60, 192,117.30 and 81,033.40 is: 121,365.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,272.60 : 192,117.30 = 81,033.40 : x
  2. Step 2: Convert to fraction form
    128,272.60/192,117.30 = 81,033.40/x
  3. Step 3: Cross multiply
    128,272.60x = 192,117.30 × 81,033.40
  4. Step 4: Simplify right side
    128,272.60x = 15,567,918,017.82
  5. Step 5: Solve for x
    x = 15,567,918,017.82/128,272.60
  6. Step 6: Final answer
    x = 121,365.89

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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.