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Finding the Fourth Proportional to 1,128.45, 1,692.60 and 479.13

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Solution

The fourth proportional to 1,128.45, 1,692.60 and 479.13 is: 718.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.45 : 1,692.60 = 479.13 : x
  2. Step 2: Convert to fraction form
    1,128.45/1,692.60 = 479.13/x
  3. Step 3: Cross multiply
    1,128.45x = 1,692.60 × 479.13
  4. Step 4: Simplify right side
    1,128.45x = 810,975.44
  5. Step 5: Solve for x
    x = 810,975.44/1,128.45
  6. Step 6: Final answer
    x = 718.66

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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.