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Finding the Fourth Proportional to 1,128.32, 1,692.60 and 306.56

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Solution

The fourth proportional to 1,128.32, 1,692.60 and 306.56 is: 459.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.32 : 1,692.60 = 306.56 : x
  2. Step 2: Convert to fraction form
    1,128.32/1,692.60 = 306.56/x
  3. Step 3: Cross multiply
    1,128.32x = 1,692.60 × 306.56
  4. Step 4: Simplify right side
    1,128.32x = 518,883.46
  5. Step 5: Solve for x
    x = 518,883.46/1,128.32
  6. Step 6: Final answer
    x = 459.87

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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.