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Finding the Fourth Proportional to 39,756.51, 54,865.02 and 21,851.99

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Solution

The fourth proportional to 39,756.51, 54,865.02 and 21,851.99 is: 30,156.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,756.51 : 54,865.02 = 21,851.99 : x
  2. Step 2: Convert to fraction form
    39,756.51/54,865.02 = 21,851.99/x
  3. Step 3: Cross multiply
    39,756.51x = 54,865.02 × 21,851.99
  4. Step 4: Simplify right side
    39,756.51x = 1,198,909,868.39
  5. Step 5: Solve for x
    x = 1,198,909,868.39/39,756.51
  6. Step 6: Final answer
    x = 30,156.32

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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.