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Finding the Fourth Proportional to 3,135.80, 4,711.80 and 2,779.40

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Solution

The fourth proportional to 3,135.80, 4,711.80 and 2,779.40 is: 4,176.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,135.80 : 4,711.80 = 2,779.40 : x
  2. Step 2: Convert to fraction form
    3,135.80/4,711.80 = 2,779.40/x
  3. Step 3: Cross multiply
    3,135.80x = 4,711.80 × 2,779.40
  4. Step 4: Simplify right side
    3,135.80x = 13,095,976.92
  5. Step 5: Solve for x
    x = 13,095,976.92/3,135.80
  6. Step 6: Final answer
    x = 4,176.28

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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.