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Finding the Fourth Proportional to 39,483.58, 54,485.79 and 21,578.80

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Solution

The fourth proportional to 39,483.58, 54,485.79 and 21,578.80 is: 29,777.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,483.58 : 54,485.79 = 21,578.80 : x
  2. Step 2: Convert to fraction form
    39,483.58/54,485.79 = 21,578.80/x
  3. Step 3: Cross multiply
    39,483.58x = 54,485.79 × 21,578.80
  4. Step 4: Simplify right side
    39,483.58x = 1,175,737,965.25
  5. Step 5: Solve for x
    x = 1,175,737,965.25/39,483.58
  6. Step 6: Final answer
    x = 29,777.90

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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.