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Finding the Fourth Proportional to 39,893.51, 55,052.78 and 21,988.53

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Solution

The fourth proportional to 39,893.51, 55,052.78 and 21,988.53 is: 30,344.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,893.51 : 55,052.78 = 21,988.53 : x
  2. Step 2: Convert to fraction form
    39,893.51/55,052.78 = 21,988.53/x
  3. Step 3: Cross multiply
    39,893.51x = 55,052.78 × 21,988.53
  4. Step 4: Simplify right side
    39,893.51x = 1,210,529,594.67
  5. Step 5: Solve for x
    x = 1,210,529,594.67/39,893.51
  6. Step 6: Final answer
    x = 30,344.02

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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.