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Finding the Fourth Proportional to 128,035.60, 192,053.40 and 72,739.60

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Solution

The fourth proportional to 128,035.60, 192,053.40 and 72,739.60 is: 109,109.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,035.60 : 192,053.40 = 72,739.60 : x
  2. Step 2: Convert to fraction form
    128,035.60/192,053.40 = 72,739.60/x
  3. Step 3: Cross multiply
    128,035.60x = 192,053.40 × 72,739.60
  4. Step 4: Simplify right side
    128,035.60x = 13,969,887,494.64
  5. Step 5: Solve for x
    x = 13,969,887,494.64/128,035.60
  6. Step 6: Final answer
    x = 109,109.40

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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.