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Finding the Fourth Proportional to 7,860.90, 11,790.81 and 2,928.27

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Solution

The fourth proportional to 7,860.90, 11,790.81 and 2,928.27 is: 4,392.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,860.90 : 11,790.81 = 2,928.27 : x
  2. Step 2: Convert to fraction form
    7,860.90/11,790.81 = 2,928.27/x
  3. Step 3: Cross multiply
    7,860.90x = 11,790.81 × 2,928.27
  4. Step 4: Simplify right side
    7,860.90x = 34,526,675.20
  5. Step 5: Solve for x
    x = 34,526,675.20/7,860.90
  6. Step 6: Final answer
    x = 4,392.20

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1.5x scale

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.