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Finding the Fourth Proportional to 1,128.27, 1,692.40 and 839.91

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Solution

The fourth proportional to 1,128.27, 1,692.40 and 839.91 is: 1,259.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.27 : 1,692.40 = 839.91 : x
  2. Step 2: Convert to fraction form
    1,128.27/1,692.40 = 839.91/x
  3. Step 3: Cross multiply
    1,128.27x = 1,692.40 × 839.91
  4. Step 4: Simplify right side
    1,128.27x = 1,421,463.68
  5. Step 5: Solve for x
    x = 1,421,463.68/1,128.27
  6. Step 6: Final answer
    x = 1,259.86

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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.