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Finding the Fourth Proportional to 8,991.80, 13,503.90 and 8,700.20

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Solution

The fourth proportional to 8,991.80, 13,503.90 and 8,700.20 is: 13,065.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.80 : 13,503.90 = 8,700.20 : x
  2. Step 2: Convert to fraction form
    8,991.80/13,503.90 = 8,700.20/x
  3. Step 3: Cross multiply
    8,991.80x = 13,503.90 × 8,700.20
  4. Step 4: Simplify right side
    8,991.80x = 117,486,630.78
  5. Step 5: Solve for x
    x = 117,486,630.78/8,991.80
  6. Step 6: Final answer
    x = 13,065.97

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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.