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Finding the Fourth Proportional to 38,692.88, 53,396.78 and 21,700.90

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Solution

The fourth proportional to 38,692.88, 53,396.78 and 21,700.90 is: 29,947.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,692.88 : 53,396.78 = 21,700.90 : x
  2. Step 2: Convert to fraction form
    38,692.88/53,396.78 = 21,700.90/x
  3. Step 3: Cross multiply
    38,692.88x = 53,396.78 × 21,700.90
  4. Step 4: Simplify right side
    38,692.88x = 1,158,758,183.10
  5. Step 5: Solve for x
    x = 1,158,758,183.10/38,692.88
  6. Step 6: Final answer
    x = 29,947.58

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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.