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Finding the Fourth Proportional to 39,858.76, 55,007.58 and 21,953.76

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Solution

The fourth proportional to 39,858.76, 55,007.58 and 21,953.76 is: 30,297.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,858.76 : 55,007.58 = 21,953.76 : x
  2. Step 2: Convert to fraction form
    39,858.76/55,007.58 = 21,953.76/x
  3. Step 3: Cross multiply
    39,858.76x = 55,007.58 × 21,953.76
  4. Step 4: Simplify right side
    39,858.76x = 1,207,623,209.50
  5. Step 5: Solve for x
    x = 1,207,623,209.50/39,858.76
  6. Step 6: Final answer
    x = 30,297.56

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1.5x scale

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.