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Finding the Fourth Proportional to 128,603.39, 193,200.73 and 90,739.80

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Solution

The fourth proportional to 128,603.39, 193,200.73 and 90,739.80 is: 136,318.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,603.39 : 193,200.73 = 90,739.80 : x
  2. Step 2: Convert to fraction form
    128,603.39/193,200.73 = 90,739.80/x
  3. Step 3: Cross multiply
    128,603.39x = 193,200.73 × 90,739.80
  4. Step 4: Simplify right side
    128,603.39x = 17,530,995,373.20
  5. Step 5: Solve for x
    x = 17,530,995,373.20/128,603.39
  6. Step 6: Final answer
    x = 136,318.30

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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.