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Finding the Fourth Proportional to 13,355.18, 18,433.98 and 8,821.18

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Solution

The fourth proportional to 13,355.18, 18,433.98 and 8,821.18 is: 12,175.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,355.18 : 18,433.98 = 8,821.18 : x
  2. Step 2: Convert to fraction form
    13,355.18/18,433.98 = 8,821.18/x
  3. Step 3: Cross multiply
    13,355.18x = 18,433.98 × 8,821.18
  4. Step 4: Simplify right side
    13,355.18x = 162,609,363.53
  5. Step 5: Solve for x
    x = 162,609,363.53/13,355.18
  6. Step 6: Final answer
    x = 12,175.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.