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Finding the Fourth Proportional to 13,291.49, 18,349.88 and 8,821.29

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Solution

The fourth proportional to 13,291.49, 18,349.88 and 8,821.29 is: 12,178.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,291.49 : 18,349.88 = 8,821.29 : x
  2. Step 2: Convert to fraction form
    13,291.49/18,349.88 = 8,821.29/x
  3. Step 3: Cross multiply
    13,291.49x = 18,349.88 × 8,821.29
  4. Step 4: Simplify right side
    13,291.49x = 161,869,568.84
  5. Step 5: Solve for x
    x = 161,869,568.84/13,291.49
  6. Step 6: Final answer
    x = 12,178.44

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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.