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Finding the Fourth Proportional to 7,385.80, 11,081.40 and 7,115.80

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Solution

The fourth proportional to 7,385.80, 11,081.40 and 7,115.80 is: 10,676.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,385.80 : 11,081.40 = 7,115.80 : x
  2. Step 2: Convert to fraction form
    7,385.80/11,081.40 = 7,115.80/x
  3. Step 3: Cross multiply
    7,385.80x = 11,081.40 × 7,115.80
  4. Step 4: Simplify right side
    7,385.80x = 78,853,026.12
  5. Step 5: Solve for x
    x = 78,853,026.12/7,385.80
  6. Step 6: Final answer
    x = 10,676.30

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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.