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Finding the Fourth Proportional to 8,987.80, 13,481.70 and 8,210.20

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Solution

The fourth proportional to 8,987.80, 13,481.70 and 8,210.20 is: 12,315.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,987.80 : 13,481.70 = 8,210.20 : x
  2. Step 2: Convert to fraction form
    8,987.80/13,481.70 = 8,210.20/x
  3. Step 3: Cross multiply
    8,987.80x = 13,481.70 × 8,210.20
  4. Step 4: Simplify right side
    8,987.80x = 110,687,453.34
  5. Step 5: Solve for x
    x = 110,687,453.34/8,987.80
  6. Step 6: Final answer
    x = 12,315.30

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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.