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Finding the Fourth Proportional to 217,387.40, 325,821.90 and 91,027.40

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Solution

The fourth proportional to 217,387.40, 325,821.90 and 91,027.40 is: 136,432.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,387.40 : 325,821.90 = 91,027.40 : x
  2. Step 2: Convert to fraction form
    217,387.40/325,821.90 = 91,027.40/x
  3. Step 3: Cross multiply
    217,387.40x = 325,821.90 × 91,027.40
  4. Step 4: Simplify right side
    217,387.40x = 29,658,720,420.06
  5. Step 5: Solve for x
    x = 29,658,720,420.06/217,387.40
  6. Step 6: Final answer
    x = 136,432.56

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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.