Home / 1,128.20-1,692.10-306.37

Finding the Fourth Proportional to 1,128.20, 1,692.10 and 306.37

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Solution

The fourth proportional to 1,128.20, 1,692.10 and 306.37 is: 459.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.20 : 1,692.10 = 306.37 : x
  2. Step 2: Convert to fraction form
    1,128.20/1,692.10 = 306.37/x
  3. Step 3: Cross multiply
    1,128.20x = 1,692.10 × 306.37
  4. Step 4: Simplify right side
    1,128.20x = 518,408.68
  5. Step 5: Solve for x
    x = 518,408.68/1,128.20
  6. Step 6: Final answer
    x = 459.50

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Double scale
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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.