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Finding the Fourth Proportional to 3,156.80, 4,735.96 and 965.40

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Solution

The fourth proportional to 3,156.80, 4,735.96 and 965.40 is: 1,448.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,156.80 : 4,735.96 = 965.40 : x
  2. Step 2: Convert to fraction form
    3,156.80/4,735.96 = 965.40/x
  3. Step 3: Cross multiply
    3,156.80x = 4,735.96 × 965.40
  4. Step 4: Simplify right side
    3,156.80x = 4,572,095.78
  5. Step 5: Solve for x
    x = 4,572,095.78/3,156.80
  6. Step 6: Final answer
    x = 1,448.33

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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.