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Finding the Fourth Proportional to 7,890.80, 11,833.40 and 3,500.40

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Solution

The fourth proportional to 7,890.80, 11,833.40 and 3,500.40 is: 5,249.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.80 : 11,833.40 = 3,500.40 : x
  2. Step 2: Convert to fraction form
    7,890.80/11,833.40 = 3,500.40/x
  3. Step 3: Cross multiply
    7,890.80x = 11,833.40 × 3,500.40
  4. Step 4: Simplify right side
    7,890.80x = 41,421,633.36
  5. Step 5: Solve for x
    x = 41,421,633.36/7,890.80
  6. Step 6: Final answer
    x = 5,249.36

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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.