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Finding the Fourth Proportional to 39,783.87, 54,900.48 and 21,878.82

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Solution

The fourth proportional to 39,783.87, 54,900.48 and 21,878.82 is: 30,192.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,783.87 : 54,900.48 = 21,878.82 : x
  2. Step 2: Convert to fraction form
    39,783.87/54,900.48 = 21,878.82/x
  3. Step 3: Cross multiply
    39,783.87x = 54,900.48 × 21,878.82
  4. Step 4: Simplify right side
    39,783.87x = 1,201,157,801.88
  5. Step 5: Solve for x
    x = 1,201,157,801.88/39,783.87
  6. Step 6: Final answer
    x = 30,192.08

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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.