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Finding the Fourth Proportional to 217,009.53, 325,407.78 and 90,611.87

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Solution

The fourth proportional to 217,009.53, 325,407.78 and 90,611.87 is: 135,873.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,009.53 : 325,407.78 = 90,611.87 : x
  2. Step 2: Convert to fraction form
    217,009.53/325,407.78 = 90,611.87/x
  3. Step 3: Cross multiply
    217,009.53x = 325,407.78 × 90,611.87
  4. Step 4: Simplify right side
    217,009.53x = 29,485,805,831.31
  5. Step 5: Solve for x
    x = 29,485,805,831.31/217,009.53
  6. Step 6: Final answer
    x = 135,873.32

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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.