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Finding the Fourth Proportional to 128,000.55, 191,845.01 and 90,571.42

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Solution

The fourth proportional to 128,000.55, 191,845.01 and 90,571.42 is: 135,746.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,000.55 : 191,845.01 = 90,571.42 : x
  2. Step 2: Convert to fraction form
    128,000.55/191,845.01 = 90,571.42/x
  3. Step 3: Cross multiply
    128,000.55x = 191,845.01 × 90,571.42
  4. Step 4: Simplify right side
    128,000.55x = 17,375,673,853.26
  5. Step 5: Solve for x
    x = 17,375,673,853.26/128,000.55
  6. Step 6: Final answer
    x = 135,746.86

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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.