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Finding the Fourth Proportional to 128,001.80, 191,565.30 and 112,255.40

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Solution

The fourth proportional to 128,001.80, 191,565.30 and 112,255.40 is: 167,999.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,001.80 : 191,565.30 = 112,255.40 : x
  2. Step 2: Convert to fraction form
    128,001.80/191,565.30 = 112,255.40/x
  3. Step 3: Cross multiply
    128,001.80x = 191,565.30 × 112,255.40
  4. Step 4: Simplify right side
    128,001.80x = 21,504,239,377.62
  5. Step 5: Solve for x
    x = 21,504,239,377.62/128,001.80
  6. Step 6: Final answer
    x = 167,999.51

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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.