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Finding the Fourth Proportional to 7,890.90, 11,879.10 and 7,202.00

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Solution

The fourth proportional to 7,890.90, 11,879.10 and 7,202.00 is: 10,842.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,890.90 : 11,879.10 = 7,202.00 : x
  2. Step 2: Convert to fraction form
    7,890.90/11,879.10 = 7,202.00/x
  3. Step 3: Cross multiply
    7,890.90x = 11,879.10 × 7,202.00
  4. Step 4: Simplify right side
    7,890.90x = 85,553,218.80
  5. Step 5: Solve for x
    x = 85,553,218.80/7,890.90
  6. Step 6: Final answer
    x = 10,842.01

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.