Home / 3,128.13-4,692.23-819.63

Finding the Fourth Proportional to 3,128.13, 4,692.23 and 819.63

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Solution

The fourth proportional to 3,128.13, 4,692.23 and 819.63 is: 1,229.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.13 : 4,692.23 = 819.63 : x
  2. Step 2: Convert to fraction form
    3,128.13/4,692.23 = 819.63/x
  3. Step 3: Cross multiply
    3,128.13x = 4,692.23 × 819.63
  4. Step 4: Simplify right side
    3,128.13x = 3,845,892.47
  5. Step 5: Solve for x
    x = 3,845,892.47/3,128.13
  6. Step 6: Final answer
    x = 1,229.45

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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.