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Finding the Fourth Proportional to 1,762.80, 2,640.72 and 939.96

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Solution

The fourth proportional to 1,762.80, 2,640.72 and 939.96 is: 1,408.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,762.80 : 2,640.72 = 939.96 : x
  2. Step 2: Convert to fraction form
    1,762.80/2,640.72 = 939.96/x
  3. Step 3: Cross multiply
    1,762.80x = 2,640.72 × 939.96
  4. Step 4: Simplify right side
    1,762.80x = 2,482,171.17
  5. Step 5: Solve for x
    x = 2,482,171.17/1,762.80
  6. Step 6: Final answer
    x = 1,408.08

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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.