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Finding the Fourth Proportional to 39,755.64, 54,862.80 and 21,850.50

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Solution

The fourth proportional to 39,755.64, 54,862.80 and 21,850.50 is: 30,153.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,755.64 : 54,862.80 = 21,850.50 : x
  2. Step 2: Convert to fraction form
    39,755.64/54,862.80 = 21,850.50/x
  3. Step 3: Cross multiply
    39,755.64x = 54,862.80 × 21,850.50
  4. Step 4: Simplify right side
    39,755.64x = 1,198,779,611.40
  5. Step 5: Solve for x
    x = 1,198,779,611.40/39,755.64
  6. Step 6: Final answer
    x = 30,153.70

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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.