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Finding the Fourth Proportional to 1,128.39, 1,692.38 and 306.56

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Solution

The fourth proportional to 1,128.39, 1,692.38 and 306.56 is: 459.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.39 : 1,692.38 = 306.56 : x
  2. Step 2: Convert to fraction form
    1,128.39/1,692.38 = 306.56/x
  3. Step 3: Cross multiply
    1,128.39x = 1,692.38 × 306.56
  4. Step 4: Simplify right side
    1,128.39x = 518,808.32
  5. Step 5: Solve for x
    x = 518,808.32/1,128.39
  6. Step 6: Final answer
    x = 459.78

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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.