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Finding the Fourth Proportional to 28,571.68, 42,857.84 and 7,795.20

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Solution

The fourth proportional to 28,571.68, 42,857.84 and 7,795.20 is: 11,692.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,571.68 : 42,857.84 = 7,795.20 : x
  2. Step 2: Convert to fraction form
    28,571.68/42,857.84 = 7,795.20/x
  3. Step 3: Cross multiply
    28,571.68x = 42,857.84 × 7,795.20
  4. Step 4: Simplify right side
    28,571.68x = 334,085,434.37
  5. Step 5: Solve for x
    x = 334,085,434.37/28,571.68
  6. Step 6: Final answer
    x = 11,692.89

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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.