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Finding the Fourth Proportional to 1,128.06, 1,692.40 and 641.46

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Solution

The fourth proportional to 1,128.06, 1,692.40 and 641.46 is: 962.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.06 : 1,692.40 = 641.46 : x
  2. Step 2: Convert to fraction form
    1,128.06/1,692.40 = 641.46/x
  3. Step 3: Cross multiply
    1,128.06x = 1,692.40 × 641.46
  4. Step 4: Simplify right side
    1,128.06x = 1,085,606.90
  5. Step 5: Solve for x
    x = 1,085,606.90/1,128.06
  6. Step 6: Final answer
    x = 962.37

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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.