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Finding the Fourth Proportional to 8,991.98, 13,555.32 and 8,389.88

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Solution

The fourth proportional to 8,991.98, 13,555.32 and 8,389.88 is: 12,647.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,991.98 : 13,555.32 = 8,389.88 : x
  2. Step 2: Convert to fraction form
    8,991.98/13,555.32 = 8,389.88/x
  3. Step 3: Cross multiply
    8,991.98x = 13,555.32 × 8,389.88
  4. Step 4: Simplify right side
    8,991.98x = 113,727,508.16
  5. Step 5: Solve for x
    x = 113,727,508.16/8,991.98
  6. Step 6: Final answer
    x = 12,647.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.