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Finding the Fourth Proportional to 7,910.80, 11,855.40 and 5,270.80

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Solution

The fourth proportional to 7,910.80, 11,855.40 and 5,270.80 is: 7,899.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,910.80 : 11,855.40 = 5,270.80 : x
  2. Step 2: Convert to fraction form
    7,910.80/11,855.40 = 5,270.80/x
  3. Step 3: Cross multiply
    7,910.80x = 11,855.40 × 5,270.80
  4. Step 4: Simplify right side
    7,910.80x = 62,487,442.32
  5. Step 5: Solve for x
    x = 62,487,442.32/7,910.80
  6. Step 6: Final answer
    x = 7,899.00

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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.