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Finding the Fourth Proportional to 128,315.80, 192,692.40 and 91,136.80

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Solution

The fourth proportional to 128,315.80, 192,692.40 and 91,136.80 is: 136,860.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,315.80 : 192,692.40 = 91,136.80 : x
  2. Step 2: Convert to fraction form
    128,315.80/192,692.40 = 91,136.80/x
  3. Step 3: Cross multiply
    128,315.80x = 192,692.40 × 91,136.80
  4. Step 4: Simplify right side
    128,315.80x = 17,561,368,720.32
  5. Step 5: Solve for x
    x = 17,561,368,720.32/128,315.80
  6. Step 6: Final answer
    x = 136,860.53

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.