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Finding the Fourth Proportional to 159,387.54, 219,946.31 and 91,401.21

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Solution

The fourth proportional to 159,387.54, 219,946.31 and 91,401.21 is: 126,128.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    159,387.54 : 219,946.31 = 91,401.21 : x
  2. Step 2: Convert to fraction form
    159,387.54/219,946.31 = 91,401.21/x
  3. Step 3: Cross multiply
    159,387.54x = 219,946.31 × 91,401.21
  4. Step 4: Simplify right side
    159,387.54x = 20,103,358,412.03
  5. Step 5: Solve for x
    x = 20,103,358,412.03/159,387.54
  6. Step 6: Final answer
    x = 126,128.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.