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Finding the Fourth Proportional to 128,422.40, 192,652.08 and 39,683.68

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Solution

The fourth proportional to 128,422.40, 192,652.08 and 39,683.68 is: 59,531.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,422.40 : 192,652.08 = 39,683.68 : x
  2. Step 2: Convert to fraction form
    128,422.40/192,652.08 = 39,683.68/x
  3. Step 3: Cross multiply
    128,422.40x = 192,652.08 × 39,683.68
  4. Step 4: Simplify right side
    128,422.40x = 7,645,143,494.05
  5. Step 5: Solve for x
    x = 7,645,143,494.05/128,422.40
  6. Step 6: Final answer
    x = 59,531.23

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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.