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Finding the Fourth Proportional to 325,228.81, 487,828.16 and 85,336.78

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Solution

The fourth proportional to 325,228.81, 487,828.16 and 85,336.78 is: 128,001.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    325,228.81 : 487,828.16 = 85,336.78 : x
  2. Step 2: Convert to fraction form
    325,228.81/487,828.16 = 85,336.78/x
  3. Step 3: Cross multiply
    325,228.81x = 487,828.16 × 85,336.78
  4. Step 4: Simplify right side
    325,228.81x = 41,629,681,928.58
  5. Step 5: Solve for x
    x = 41,629,681,928.58/325,228.81
  6. Step 6: Final answer
    x = 128,001.21

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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.