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Finding the Fourth Proportional to 128,122.56, 191,403 and 123,456.96

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Solution

The fourth proportional to 128,122.56, 191,403 and 123,456.96 is: 184,433.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,122.56 : 191,403 = 123,456.96 : x
  2. Step 2: Convert to fraction form
    128,122.56/191,403 = 123,456.96/x
  3. Step 3: Cross multiply
    128,122.56x = 191,403 × 123,456.96
  4. Step 4: Simplify right side
    128,122.56x = 23,630,032,514.88
  5. Step 5: Solve for x
    x = 23,630,032,514.88/128,122.56
  6. Step 6: Final answer
    x = 184,433.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.