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Finding the Fourth Proportional to 8,690.80, 13,036.20 and 5,234.80

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Solution

The fourth proportional to 8,690.80, 13,036.20 and 5,234.80 is: 7,852.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.80 : 13,036.20 = 5,234.80 : x
  2. Step 2: Convert to fraction form
    8,690.80/13,036.20 = 5,234.80/x
  3. Step 3: Cross multiply
    8,690.80x = 13,036.20 × 5,234.80
  4. Step 4: Simplify right side
    8,690.80x = 68,241,899.76
  5. Step 5: Solve for x
    x = 68,241,899.76/8,690.80
  6. Step 6: Final answer
    x = 7,852.20

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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.